The aptitude test was online. It had negative marking. Speed is important here. Prepare well for it.

Those who clear the test must sit for the GD. GD topics are very simple. Speak sense. Focus on quality versus quantity, and you should make it through this round, unless, of course, you are towards the end where they have reached the number of people whom they wish to shortlist for the next round. Then it is a matter of luck.

For the interview, the focus is on communication skills and technical questions on projects. Again, if you are towards the end, as some of my friends were, then do not expect to be selected as your interview will not be taken in a serious manner. They will not be bothered, as the panelists, being tired, will shortlist from earlier students.

None... Basic questions like, "What is Java?" Know your projects well.