There are 3 rounds overall. Every round is an elimination round. So, prepare well.
In Aptitude, prepare Coding and Decoding topics well, also Numbers and series are also asked in the online test, Microsoft Office fundamentals, also some Cloud Computing questions are asked.
Two coding questions are asked ranging from easy to medium level. After you clear this round, the very next day will be the communication assessment round. Your listening capabilities and your communication skills will be tested. Make sure you have a good headset with a microphone(a microphone is a must).
After 5 days, there will be an HR interview for only those who clear the communication assessment round as well.