Hello Vibhanshi,
I can help you with some tips for a personal interview at Christ University, Bangalore
Keep the following things in mind : 
1) Display confidence in your speech - but not arrogance. Show them that you are sure of what course you have opted for, and that you want to stick with this decision. It would help if you had clear points beforehand to support this.
2) The interviewers have a brilliant knack of testing your tolerance towards bullshit - bullshit here means an unnecessary display of power and authority. They love to tell you you're not good enough - and try to strip you of any dignity. I may be exaggerating this, but it is displayed in varied levels. But this is mostly done because you need them more than they need you. So if anything like this happens, keep calm, brush it off and don't let them get to you.
3) Dress formally - do not turn up wearing jeans and a t-shirt. Wear formal pants and a shirt, or if you're a girl wear a kurta and a salwar (don't wear leggings).
4) Stay humble - they like to see people who can take tolerate forceful authority - cause you will be facing a LOT of that once you get in. So don't back answer, just swallow your pride for those 15 minutes.

GOOD LUCK!!