You can go for self study if you can figure things out by yourself. For that you can take any good coaching study material from the market or you can get it photocopied and can start your studies in a proper way. You can also get help from online youtube channels. But if you really are facing problems in figuring out things, then you should join a good top coaching:
AskIITians
Kalrashukla Classes
Mahesh tutorials
Remember there will be tough competition.