They first give you 4 coding tests and if you pass all four they give you a technical interview. In this interview they ask about the technical aspects of your CV and they will also ask you to solve coding questions.

3 Rounds 1st - small 16 min psychometric type test (online). 2nd - 75 min simple code test (online). 3rd - onsite 8hr Code Test. Basically if you want the job you should know your algorithms like the back of your hand. Their highering standard is quiet high. Even though its an internship but to get in you should really know how to code well.