Colleges in Bangalore

Honestly speaking, the ET is pretty easy. You should have a fair idea of the current affairs and general and basic history of the country and its media (newspapers, radio, TV; just basic and general). That's it.
The PI is nothing but the interviewer's test at getting to know how much you want to join the college, what skills and temperament you possess to succeed decently in the course, what are you expecting out of the course and university and how keen and willing are you to learn more than anything else. An interview is nothing but a formal chit chat in an attempt to know both the parties better. Be confident, polite, and humble and ask one or two questions out of genuine curiosity- leaves a better impression. And more than anything, be honest in your answers and talks, don't try and be something that you aren't and say blow up something that you don't know.
All the best.