Am I eligible for admission into IIMs? I got 65% in Class 10 and 79% in Class 12.

Yes, you can still get into an IIM, but it depends on which IIM you're aiming for. Some IIMs look at your Class 10 and 12 marks, and some don't give them much importance. Your 65% in Class 10 and 79% in Class 12 might make it a little harder at top IIMs, but if you get a really good score in the CAT