The motive to join a coaching is to learn something new and able to achieve something. If one is going to coaching and not learning something new there could be few reasons:
1) Population of the class is too high, Over crowded hence couldn’t clear your doubt.
2)It’s a place which only complete the syllabus.
3)No personal or individual session to clarify the problems.
4)It’s more like a moneymaking place then learning center.
5)Facility or teacher it self is not interested, just doing it for a sake.
6)Does not give any motivation to ask a question or participate.
Most of the places a days are just making money by the the name of XYZ Coaching centers, so before you enter always do a verification by your own by asking the ex students or the current ones, take demo classes and go for the online review which helps understanding the reality.