CBSE Class 9 Maths Revision Notes
CBSE Class 9th Maths Revision Notes is an important phase of studentâ€™s life when theyâ€™re at a turning point in their life. The reason being class 9 is the foundation level to succeed in class 10. As you know, students must complete Class 9 in order to sit for Class 10 board examinations. Also, it lays the groundwork for the following classes. A kid who is wellversed in class 9 topics would find it simpler to perform well in competitive exams. Math and science are two subjects that demand a lot of practice to score in class 9. Hence we brought out the best from our resource treasury – CBSE Class 9 Maths Notes. GeeksforGeeks specially curated NCERT Notes for Class 9 Maths, compiled by experts.
Class 9th Maths Notes cover some more important topics like Experimental Probability, Volumes of Cubes and Cuboids, Mean, Median, Mode, Range, etc. Our experts have also covered Class 9 Maths Solutions like NCERT Solutions for Class 9 Maths, and RD Sharma Class 9 Solutions.
CBSE Class 9th Maths Revision Notes Chapters List (20232024)
Deleted Chapters/Topics from NCERT Class 9th Maths Textbook (20232024):
The most recent CBSE Class 9th Mathematics syllabus has been changed and reduced by 30% for the upcoming annual assessment in the academic year 20232024, you can find the list of all deleted chapters/topics in the table below:
Chapters 
Deleted Topics/Chapter 

Chapter 1: Number Systems 

Chapter 2: Polynomials 

Chapter 3: Coordinate Geometry 

Chapter 4: Linear Equations in Two Variables 

Chapter 5: Introductionâ€“ Euclidean Geometry 

Chapter 6: Lines and Angles 

Chapter 7: Triangles 

Chapter 8: Quadrilaterals 

Chapter 9: Areas of Parallelogram and Triangles 

Chapter 10: Circles 

Chapter 11: Construction 

Chapter 12: Heronâ€™s Formula 

Chapter 13: Surface Area and Volume 

Chapter 14: Statistics 

Chapter 15: Probability 

Chapter 1: Number Systems
The numeral or number system is the combination of natural, integers, rational, irrational, and real numbers. This lesson covers the entire concepts of the numeral system and its types, representation on the number line, laws of rational exponents, and integral powers. To simplify the concept of number systems, the technique of portraying numbers on a number line using certain rules and symbols is known as a number system. A number line is a straightline representation of integers with a set spacing between them. The Number System is used to do mathematical computations ranging from intricate scientific calculations to calculate how many chocolates are left in the box.
The major topics covered in the Number systems chapter in Class 9 are the Representation of natural numbers, integers, rational numbers on the number line, Rational numbers as recurring/ terminating decimals, and Operations on real numbers. Some topics which have great importance in further chapters of Class 9 are the Rationalization of real numbers and Laws of exponents for real numbers
CBSE Class 9th Maths Revision Notes Chapter 1 Number Systems 






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Important rules that are used in CBSE Class 9 Maths Revision Notes Chapter 1 Number Systems are:
 âˆšab = âˆša Ã— âˆšb
 âˆš(a/b)= âˆša/âˆšb
 (âˆša + âˆšb) Ã— (âˆša – âˆšb) = aâˆ’b
 (a + âˆšb) Ã— (a âˆ’ âˆšb) = a^{2} âˆ’b
 (âˆša+âˆšb)^{2} =a^{2} + 2âˆšab +b
 a^{p} Ã— b^{q }= (ab)^{p+q}
 (a^{p})^{q} = a^{pq}
 a^{p} / a^{q }= (a)^{pq}
 a^{p} / b^{p} = (ab)^{p}
Chapter 2: Polynomials
A polynomial expression is made up of variables, which are also known as indeterminates and coefficients in mathematics. The coefficients involve operations such as subtraction, addition, nonnegative integer variable exponents, and multiplication. Both algebraic expressions and polynomials in mathematics are made up of variables and constants, as well as arithmetic operations. The sole difference is that algebraic expressions include irrational numbers in their powers.
Topics covered in Class 9 Polynomial Chapters are the basics of polynomials in one variable (including the Coefficients of a polynomial, terms of a polynomial and zero polynomial), Degree of a polynomial and Types of PolynomialsMonomials, binomials, trinomials. Some important topics covered in this chapter are Factors and multiples, Zeros of a polynomial, and Factorization using the Factor Theorem.
CBSE Class 9th Maths Revision Notes Chapter 2 Polynomials 


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Here is the list of the important theorems learned in CBSE Class 9th Maths Revision Notes Chapter 2 Polynomials:
 Remainder Theorem: If p(x) has the degree greater than or equal to 1 and p(x) when divided by the linear polynomial x â€“ a will give the remainder as p(a).
 Factor Theorem: x â€“ a will be the factor of the polynomial p(x), whenever p(a) = 0. The viceversa also holds true every time.
CBSE Class 9th Maths Revision Notes Cover the following topics:
Chapter 3: Coordinate Geometry
Coordinate geometry is a part of geometry where the position of the points on the plane is described with the help of an ordered pair of numbers called coordinates.
Coordinate geometry is important because it connects geometry with algebra using line graphs and curves. Because it allows us to find points on any plane, coordinate geometry is helpful in mathematics. It is also used in trigonometry, calculus, and other fields. Learn about the Cartesian coordinate system, coordinate points, how to plot points on coordinate axes, quadrants with signs, and other concepts in coordinate geometry.
CBSE Class 9th Maths Revision Notes Chapter 3 Coordinate Geometry 



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Important Conclusions from CBSE Class 9th Maths Revision Notes Chapter 3 Coordinate Geometry are:
 The horizontal line is known as the xaxis and the vertical line is called the yaxis.
 The coordinates of a point are in the form of (+, +) in the first quadrant, (â€“, +) in the second quadrant, (â€“, â€“) in the third quadrant, and (+, â€“) in the fourth quadrant; where + and â€“ denotes the positive and the negative real number respectively.
 The coordinates of the origin are (0, 0) and thereby it gets up to move in the positive and negative numbers.
Chapter 4: Linear Equations in Two Variables
Any equation which can be defined in the form ax + by + c = 0, where a, b, and c are real numbers and a and b are not both zero, is called a linear equation in two variables. This chapter on Linear Equations in Two Variables is an essential subject in Mathematics since it allows us to define physical relationships between two variables, compute rates, perform conversions, and make predictions, among other things.
Students should pay special attention while solving and practicing the questions in this chapter because the majority of the questions in their examinations will require some experience in this area.
CBSE Class 9 Maths Revision Notes Chapter 4 Linear Equations in Two Variables 


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Important formulas and identities in CBSE Class 9 Maths Revision Notes Chapter 4 Linear Equations in Two Variables are:
 (a + b)^{2} = a^{2} + 2ab + b^{2}
 (a â€“ b)^{2} = a^{2} â€“ 2ab + b^{2}
 (a + b) (a â€“ b) = a^{2} b^{2}
 (x + a) (x + b) = x^{2} + (a + b) x + ab
 (x + a) (x â€“ b) = x^{2} + (a â€“ b) x â€“ ab
 (x â€“ a) (x + b) = x^{2} + (b â€“ a) x â€“ ab
 (x â€“ a) (x â€“ b) = x^{2} â€“ (a + b) x + ab
 (a + b)^{3} = a^{3} + b^{3} + 3ab (a + b)
 (a â€“ b)^{3} = a^{3} â€“ b^{3} â€“ 3ab (a â€“ b)
 (x + y + z)^{2} = x^{2} + y^{2} + z^{2} + 2xy +2yz + 2xz
 (x + y â€“ z)^{2} = x^{2} + y^{2} + z^{2} + 2xy â€“ 2yz â€“ 2xz
 (x â€“ y + z)^{2} = x^{2} + y^{2} + z^{2} â€“ 2xy â€“ 2yz + 2xz
 (x â€“ y â€“ z)^{2} = x^{2} + y^{2} + z^{2} â€“ 2xy + 2yz â€“ 2xz
 x^{3} + y^{3} + z^{3} â€“ 3xyz = (x + y + z) (x^{2} + y^{2} + z^{2} â€“ xy â€“ yz xz)
 x^{2 }+ y^{2} = 1212 [(x + y)^{2} + (x â€“ y)^{2}]
 (x + a) (x + b) (x + c) = x^{3 }+ (a + b + c)x^{2} + (ab + bc + ca)x + abc
 x^{3} + y^{3} = (x + y) (x^{2 }â€“ xy + y^{2})
 x^{3} â€“ y^{3} = (x â€“ y) (x^{2 }+ xy + y^{2})
 x^{2} + y^{2} + z^{2} â€“ xy â€“ yz â€“ zx = 1212 [(x â€“ y)^{2} + (y â€“ z)^{2} + (z â€“ x)^{2}]
Chapter 5: Introduction to Euclid’s Geometry
Euclidean geometry is the branch of geometry that deals with the study of geometrical shapes and figures based on different axioms and theorems. This study provides a brief explanation for flat surfaces. This chapter is the introduction to Euclid for Class 9 students.
This chapter is all about Euclidâ€™s method of formalizing observed phenomena into rigorous Mathematics with definitions, axioms, and postulates. Also includes the five postulates of Euclid, Equivalent versions of the fifth postulate, and a Representation of the relationship between axiom and theorem.
CBSE Class 9 Maths Revision Notes Chapter 5 Introduction to Euclid Geometry 


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Important rules from CBSE Class 9 Maths Revision Notes Chapter 5 Introduction to Euclid’s Geometry:
 Axioms: The basic facts which are taken for granted without proof are called axioms. Some of Euclid’s axioms are:
 Things which are equal to the same thing are equal to one another.
 If equals are added to equals, the wholes are equal.
 If equals are subtracted from equals, the remainders are equal.
 Things which coincide with one another are equal to one another.
 The whole is greater than the part.
 Postulates: Axioms are the general statements, postulates are the axioms relating to a particular field. Euclid’s five postulates are.
 A straight line may be drawn from anyone point to any other point.
 A terminated line can be produced indefinitely.
 A circle can be drawn with any center and any radius.
 All right angles are equal to one another.
 If a straight line falling on two straight lines makes the interior angles on the same side of it taken together less than two right angles, then the two straight lines, if produced indefinitely meet on that side on which the angles are less than two right angles.
Chapter 6: Lines and Angles
In geometry, Lines and Angles are defined as figures that are made up of infinite points extending indefinitely in both directions. Lines are straight and have length and breadth, while an angle is a figure from which two rays emerge from a common point.
To define it in simpler words, a line is defined as a row of closely spaced dots that spans in two directions indefinitely. It just has one dimension, which is its length. A line can be represented by a horizontal mark written on a sheet of paper. An angle is a figure formed by two rays that intersect at a shared terminus. A protractor is used to measure them in degrees. Lines and angles are present in all geometry forms.
This chapter majorly includes the basics of Lines and Angles and Types of angles. Also include important properties and theorems like the Angle sum property, etc.
CBSE Class 9 Maths Revision Notes Chapter 6 Lines and Angles 




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Important definitions from CBSE Class 9 Maths Revision Notes Chapter 6 Lines and Angles are:
 Acute angle: An acute angle measures between 0Â° and 90Â°.
 Right angle: A right angle is exactly equal to 90Â°.
 Obtuse angle: An angle greater than 90Â° but less than 180Â°.
 Straight angle: A straight angle is equal to 180Â°.
 Reflex angle: An angle that is greater than 180Â° but less than 360Â° is called a reflex angle.
 Complementary angles: Two angles whose sum is 90Â° are called complementary angles. Let one angle be x, then its complementary angle is (90Â°âˆ’x).
 Supplementary angles: Two angles whose sum is 180Â° are called supplementary angles. Let one angle be x, then its supplementary angle is (180Â°âˆ’x).
 Adjacent angles: Two angles are Adjacent when they have a common side and a common vertex (corner point) and don’t overlap.
 Linear pair: A linear pair of angles is formed when two lines intersect. Two angles are said to be linear if they are adjacent angles formed by two intersecting lines. The measure of a straight angle is 180Â°, so a linear pair of angles must add up to 180Â°.
 Vertically opposite angles: Vertically opposite angles are formed when two lines intersect each other at a point. Vertically opposite angles are always equal.
Chapter 7: Triangles
Geometrically, a triangle is defined as a threesided polygon consisting of three edges and three vertices. The most important and applied property of a triangle is its Angle sum property which means the sum of the internal angles of a triangle is equal to 180 degrees only.
This Chapter on Triangles explained the Congruence and various Properties of triangles. This also includes some important theorems for triangles, along with inequalities in a triangle.
CBSE Class 9 Maths Revision Notes Chapter 7 Triangles 





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Important rules covered in CBSE Class 9 Maths Revision Notes Chapter 7 Triangles are:
Congruence Rules: Here is the list of some important congruence rules of triangles,
 Side angle side (SAS) Congruence
 Angle Side Angle (ASA) Congruence
 Angle angle side (AAS) Congruence
 Side side side (SSS) Congruence
 Rightangle Hypotenuse Side (RHS) Congruence
Chapter 8: Quadrilateral
A quadrilateral is a plane geometrical figure which has four sides and four corners or vertices. Typically, quadrilaterals are rectangles, squares, trapezoids, and kites or irregular and uncharacterized figures with four sides.
The topics covered in this chapter will help students to learn all the concepts of Quadrilateral thoroughly, They are the Angle sum property of a Quadrilateral, types of quadrilaterals, properties of a parallelogram, and the midpoint theorem.
CBSE Class 9 Maths Revision Notes Chapter 8 Quadrilateral 




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Important properties that are covered in CBSE Class 9 Maths Revision Notes Chapter 8 Quadrilateral are:
 The Sum of all angles of a quadrilateral is 360Â°.
 A diagonal of a parallelogram divides it into two congruent triangles.
 In a parallelogram,
 diagonals bisect each other.
 opposite angles are equal.
 opposite sides are equal
 Diagonals of a square bisect each other at right angles and are equal, and viceversa.
 A line through the midpoint of a side of a triangle parallel to another side bisects the third side. (Midpoint theorem)
 The line segment joining the midpoints of two sides of a triangle is parallel to the third side and equal to half the third side.
 In a parallelogram, the bisectors of any two consecutive angles intersect at a right angle.
 If a diagonal of a parallelogram bisect one of the angles of a parallelogram it also bisects the second angle.
 The angle bisectors of a parallelogram form a rectangle.
 Each of the four angles of a rectangle is the right angle.
 The diagonals of a rhombus are perpendicular to each other.
Chapter 9: Areas of Parallelograms and Triangles
The area of a plane figure is described as the amount of the planar surface covered by a closed geometric figure like a rectangle, square, etc. In this chapter, we’ll try to strengthen our understanding of the equations for calculating the areas of various figures by looking at relationships between the areas of geometric shapes that have the same base and parallels. This study will also help in the understanding of several findings about ‘triangle similarity.’
The important topics covered in this chapter are the area of two or more triangles and parallelograms with the same base between the same parallels and finding the area of triangles that are split by a median as well as the area of congruent figures.
CBSE Class 9 Maths Revision Notes Chapter 9 Parallelogram and Triangles 



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Important formulas used in CBSE Class 9 Maths Revision Notes Chapter 9 Areas of Parallelograms and Triangles are:
 Area of Parallelogram = Base Ã— Height
 Area of Triangle = 1/2 Ã— Base Ã— Height or 1/2 Ã— Area of Parallelogram
 Area of Trapezium = 1/2 Ã— (Sum of its parallel sides) Ã— Distance between the two parallel side
 Area of Rhombus = 1/2 Ã— Product of its two diagonals
CBSE Class 9 Maths Revision Notes Chapter 9 covers the following topics:
Chapter 10: Circles
Be it a bottle cap or the merrygoround – the circle is a part of our daytoday life and is included in everything we saw. But how exactly circle came to be? To explain it in mathematical words, a circle is a geometrical shape that is defined as the locus of points that moves in a plane so that its distance from a fixed point is always constant. This fixed point is the Centre of the circle while the fixed distance from it is called the radius of the circle.
CBSE Class 9 Maths Revision Notes Chapter 10 Circles 




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Some important properties covered in CBSE Class 9 Maths Revision Notes Chapter 10 Circles are:
Chord: The chord of the circle is a line segment that connects any two locations on a circle. Some important properties of Chords of a circle are:
 The diameter of a circle is defined as a chord that passes across its center.
 A circle’s diameter divides it into two equal sections, which are called arcs. A semicircle is made up of these two arcs.
 If two arcs of a circle have the same degree of measure, they are said to be congruent.
 When two arcs have the same length, their associated chords are likewise the same length.
 The chord is bisected by a perpendicular drawn from the center to the chord of the circle, and vice versa.
 Three noncollinear points are intersected by one and only one circle.
 Equal circle chords are equidistant from the center.
 The line across the centers of two circles intersecting in two points is perpendicular to the common chord.
 An arc’s angle at the center of the circle is double the angle it has throughout the rest of the circumference.
 Any two angles in the same circle segment are equal.
 A circle’s equal chords form an equal angle at the center.
 The greater chord of a circle is closer to the center than the smaller chord.
 The semicircle has a right angle. At the circle’s center, equal chords subtend an equal angle.
Cyclic Quadrilateral: A quadrilateral is said to be cyclic if all of its vertices are on the perimeter of a circle.
 The sum of opposing angles in a cyclic quadrilateral is 180Â°, and vice versa.
 A cyclic quadrilateral’s exterior angle is equal to its inner opposite angle.
CBSE Class 9 Maths Revision Notes Chapter 10 covers the following topics:
Chapter 11: Constructions
Construction helps to understand the approach to constructing different types of triangles for different given conditions using a ruler and compass of required measurements. Constructions are based on Geometry which is the foundation for comprehending fundamental arithmetic principles used in many professions.
Geometry form construction is a necessary ability that necessitates a thorough understanding of their qualities. As a result, students must thoroughly research this subject. The NCERT Solutions Class 9 Maths Chapter 11 Constructions is an excellent resource for learning about this geometry topic. These solutions serve as study aids for students.
CBSE Class 9 Maths Revision Notes Chapter 11 – Constructions 



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Important constructional rules discussed in CBSE Class 9 Maths Revision Notes Chapter 11 Constructions are:
 Construction of bisector of a line segment
 Construction of bisector of a given angle
 Construction of Equilateral triangle
 Construction of a triangle when its base, sum of the other two sides and one base angle are given
 Construction of a triangle when its base, difference of the other two sides and one base angle are given
 Construction of a triangle of given perimeter and two base angles
Chapter 12: Heron’s Formula
In this chapter, a formula called Heronâ€™s formula is introduced which helps to determine the area of the triangle when three sides of it are given. The application of this formula also helps to find the area of other different polygons. Heronâ€™s formula is a useful technique to calculate the area of a triangle when the length of all three sides is given. These Class 9 Maths NCERT Notes Chapter 12 Heronâ€™s Formula will help students to understand this concept in detail.
CBSE Class 9 Maths Revision Notes Chapter 12 Heron’s Formula 


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Important formulas covered in CBSE Class 9 Maths Revision Notes Chapter 12 Heron’s Formula are:
 The semiperimeter of a Triangle, s = (a+b+c)/2
 Area of the triangle = âˆš{s(sâˆ’a)(sâˆ’b)(sâˆ’c)} sq. unit.
Chapter 13: Surface Areas and Volumes
Surface area and volume are the measures calculated for a threedimensional geometrical shape like a cube, cuboid, sphere, etc. The surface area of any given object is the area occupied by the surface of the object while volume is the amount of space available in an object.
CBSE Class 9 Maths Revision Notes Chapter 13 Surface Areas and Volumes 







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Some important formulas in CBSE Class 9 Maths Revision Notes Chapter 13 Surface Areas and Volumes are:
 TSA of a Cuboid = 2(l x b) +2(b x h) +2(h x l)
 TSA of a Cube = 6a^{2}
 TSA of a Right circular Cylinder = 2Ï€r(h+r)
 TSA of a Right circular Cone = Ï€r(l+r)
 TSA of a Sphere = 4Ï€r^{2}
 CSA of a Cuboid = 2h(l+b)
 CSA of a Cube = 4a^{2}
 CSA of a Right circular Cylinder = 2Ï€rh
 CSA of a Right circular Cone = Ï€rl
 Volume of a Cuboid = l x b x h
 Volume of a Cube = a^{3}
 Volume of a Right circular Cylinder = Ï€r^{2}h
 Volume of a Right circular Cone = 1/3Ï€r^{2}h
 Volume of a Sphere = 4/3Ï€r^{3}
Here, l is the length, b is the breadth, h is the height, r is the radius and a is the side of the respective geometrical figure.
CBSE Class 9 Maths Revision Notes Chapter 13 covers the following topics:
Chapter 14: Statistics
Statistics is the study of the representation, collection, interpretation, analysis, presentation, and organization of data. In other words, it is a mathematical way to collect and summarize data. The representation of data is different along with the frequency distribution.
Students will have a good understanding of the significance of wellorganized data, as well as the three measures of central tendency for ungrouped data, namely, mean, median, and mode, from NCERT notes for class 9 Mathematics chapter 14. After studying this topic, students will be able to apply these formulae to a wide range of problems.
CBSE Class 9 Maths Notes – Chapter 14 Statistics 




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Some important formulae and terms studied in CBSE Class 9 Maths Revision Notes Chapter 14 Statistics are
 Class mark = (Lower Limit + Upper Limit)/2
 The three central tendencies are measured as:
 Mean (xâ€¾) = Sum of all observations (âˆ‘x_{n}) / Total Number of observation (N)
 Median = The median for even number of observation is equal to the middlemost observation whole for the odd number of observation it is equal to value of ((n+1)/2)th observation.
 Mode = It is equal to observation which occurs the most or have the maximum frequency in the given data.
Chapter 15: Probability
Tossing coin yields either an up or a down result, which is easily predicted. But what if you toss two coins at once? The end product might be a head and tail combo. In the latter instance, the correct answer cannot be found, therefore only the probability of a result may be predicted. Probability is the name given to this prediction. Probability is frequently employed in all aspects of daily life, such as sports, weather forecasts, blood tests, statics, etc. In this chapter, we will study probability indepth.
The Probability in this class includes basic probability theory, which is also used in the probability distribution, to learn the possibility of outcomes for a random experiment and to find the probability of a single event to occur, when the total number of possible outcomes
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Important terms used in CBSE Class 9 Maths Revision Notes Chapter 15 Probability are:
 Probability P (E) = Number of favorable outcomes / Total Number of outcomes
 The probability of any event only lies between 1 and 0.
 Trial: It is defined as the set of observations of event in which one or more outcomes are observed.
 Event: It is defined as the collection of observation performed to observe an experiment.
CBSE Class 9 Maths Revision Notes Chapter 15 covers the following topics:
Important Resources for CBSE Class 9th provided by GeeksforGeeks
 NCERT Solutions Maths Class 9
 RD Sharma Solutions Maths Class 9
 CBSE Class 9 Maths Formulas
 CBSE Class 9 Physics Notes
 CBSE Class 9 Chemistry Notes
FAQs on Class 9th Standard Maths Notes
Question 1: Why is Class 9 Maths NCERT Chapter 1 Important?
Answer:
Since the number systems chapter covers rational and irrational numbers, real numbers and their expansion, decimal form, and the rule of exponents, it is a good way to start. As a result, the NCERT solutions for class 9 maths are important for exams.
Question 2: How to score good marks in the Class 9 Maths exam?
Answer:
 Finish the CBSE Class 9 syllabus as early as possible.
 Do not waste time as you study. Study seriously for the 56 hours daily right from the beginning.
 Solve questions every time you finish a chapter
 Do not blindly mug up the theories. Understand them first. Then you will be able to write the answers in your own words. It will also have better retention.
 Solve sample papers after the entire syllabus is finished.
 Stay calm and confident. Allocate time for your entertainment as well. This will help you stay focused.
Question 3: How many hours should I study in Class 9?
Answer:
On average, to prepare well for the exam, students should study for 6 hours per day on a regular basis. Six hours of preparation a day is more than enough for Class 9 CBSE preparation.
Question 4: Where and how can I download the complete NCERT Class 9 Syllabus, solutions, and notes?
Answer:
The students can find the complete NCERT Syllabus of CBSE Class 9 easily on the GeeksforGeeks platform. Students can also find the books, notes, and complete solutions on the GeeksforGeeks platform at no cost, to help the students prepare well.
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