when we are able to give this exam and i got 86.457 percentile in jee mains is i am eligible for this college??
Well since you have added a SAT tag so I am assuming that you want to ask about that. Well you don't need any jee mains or any other score to appear for SAT. SAT is an aptitude test that is accepted by nearly all colleges in US for students wishing to complete their undergraduate studies from there. So if you are already interested to apply abroad, go ahead and register for the test and then score well to have a good chance in getting into some best colleges of United States.
I hope this answer helps.
All the best.