Start from basics, first of fall clear your basic concepts and work on the subject you have knowledge and make that concepts strong, if you want to clear the exam in least amount of time it's better to strong the concept you already have a little bit of knowledge, rather than hoping on new concept.

What's your GD-PI story with BITS Pilani? What were the toughest moments?

What's your most interesting hostel story?

Whats do you think BITS Pilani should do to help you get placed with a good company?