Hi aspirant
There are many coaching institute's in India which are really good if you are preparing for Jee mains or Advance or any other entrance .
Some of them have branches across the country .
List is as follows:
1.Allen : Kota
2.Fiit jee:All over the country ,almost every state
3.Akash Institute :All over the country
4.Bansal:Kota
5.Resonance : Almost every state

I would suggest you to go for either of 1,2,3.
You will find amazing and supporting faculty at Fiit jee and Akash.
Some students are unable to study in gathering .If you are one of them you should avoid Allen otherwise Allen is better.Students of Kota mostly face depression which is not healthy .If can cope up with that it's OK then.


Hope this was helpful.