I was in A2 batch of jee( mains + advance) course in Allen Chandigarh. The study material they provide is very good. And the faculty is very good and almost all are from very good colleges like iits and bits pilani.
The student intake is high so no one to one interaction. You can get lost in the crowd. So, the thing you can do is focus.
The more you interact with the faculty and take the tests, the more you’ll be benefitted.