hii
Now dear this is strange .. u believe that u can study on ur own and then do not have confidence also.
See the best way to organize studies is to join a coaching institute. It is difficult to prepare for exams like JEE without going to coaching institutes. If u join a institute, then u will have a fixed shedule, u will have to do assignments regularly, there will be a regular evaluation of ur perfomance and all this will help u a lot in organizing your studies well.
Even then if u do not want to join a coaching class then try to make shedule of ur own and execute it. You need to work everyday if u want to make in .. that is very clear.
So keeep going ... cheers