Hi, zeeshanp.
as you are preparing for jee and you are just in 12th class. so you have now more  for you board exam and in jee. and so it is difficult to join any coaching in these little time , i advise you that you believe in yourself and keep confidence and try to start self-study. through self-study you will cover more topics than any coaching. you make yourself study possible if you have ability in real sence. you have to do a hard labour.
now it's totally depends upon you that what's your choice either coaching or selfstudy.
 
Note - books are the best teacher and self-study is the best study.
bye.