just concentrate on your studies.join a good coaching.make your strong belief on books.surely u will get a nice iit.

You have enough time till your exam. Just strengthen your concepts and practice a lot. Discover your own tactics to solve your own problems. Never get puzzeled at other's sayings! I would say there is no need to join any coaching class because that will restrain your concept to their conventional way. Off course this is my personal comment, because I did so and I got it! Be confident and be cool!

Best of Luck!