you should be well prepared in the following topic:
1.aptitude question.
2.reasoning question.
3.c-language basic.
you should have good communication skill,you should have good command in your project work.campus placement conduct 3-4 rounds:
1.written test. discussion.
3.technical round.
4.personal interview.
you should have knowledge in "current affairs" in order to prepare for GD.prepare your resume.