There will be total of 3 to 4 rounds.
Aptitude test
Manager round
Hiring manager round
Another round might be added (f2f)
Aptitude test is generic maths questions from 10th to your degree refer online material to crack it 30 min 12 questions mostly quant.
Manager round is mostly to get a understanding of what you have done in your previews profile and manager also checks your enthusiasm and your drive for problem solving.
Hiring manager round is slightly more difficult as it will mostly be scenario driven questions. And you need to some how try to convince the manager that you can handle a situation correctly. Also he will try to see if you are generally a good fit for the company. Be ready to talk about your previous company in detail and what are your achievements.