Hello,
Well my friend in Agra you will find many coaching institutes claiming to be one of the best. The best one for me maybe the worst one for you so In my opinion, any decent coaching class will suffice since a coaching class contributes only about 30 - 40% towards your success in JEE, unlike the hype they have generated through ads and other media. A coaching class is necessary but isn't the only thing that helps you to do well.

But now you have asked for it i can tell you that one of my friend is residing in Agra and he told that resonance institute in Agra is good one for droppers and the faculty is very good. Resonance is a premier institute in iit coaching so you can join that if you wish to join that.

I wish you all the best !!

Cheers !!