Should I drop a year for IIT or should I join any college, like Bennett University, VIT etc.?

First of all, you have to be completely clear with yourself truly that – “Are you totally sure? Are you really into JEE Advanced with all your heart? And are you willing to give your all in these 1 year?” You have to be completely honest with yourself with questions like these because this 1 year will be very important. You will have to be working a lot harder and you have to SACRIFICE a lot during this period. Even after sacrificing, there will be no guarantee that you will better this year’s performance.