I got 65% in class 12th and 61 percentile in jee mains which reputed college i can get

Hello aspirant,
Yes of course you are eligible for giving jee mains examination.
But for giving the prestigious iit jee advanced examination you have to score a min of 75% marks or be in the top 20 percentile of your board examines.
For enterence in nits, iiits, or other gftis it is compulsory to get 75% but if you are opting for other state government colleges or private colleges then 45% marks would also work as per the cutoff criteria.
Hope yours confusion is clear and
BEST OF LUCK FOR YOUR FUTURE
THANK you
I hope you understand......