Hello Abhinandan,
IITJEE is a difficult exam.
How to prepare is the next question that comes in our mind
Heres how you do it,
1.try learning 4-5 hours per day.on hollidays make that 8-10 hours per day.
2.try understanding what you learn and learn how to apply it in various cases.
3.try following your teachers.And ask doubts if you have.DO NOT LEAVE YOUR DOUBTS WITHOUT CLEARING BECAUSE NO QUESTION IS SMALL IN ANY CASE.
4.don't be just a study guy,have some enjoyment also that will refresh your mind even better.
5.try having good sleep.<not much,6-8 hours is enough>
6.try following good books like
HC VERMA
BOOKS OF GRB PUBLICATION
ARIHANT PUBLICATION BOOKS
RESNICK HALLIDAY AND KRANE
CUTNELL AND JOHNSON ETC.......
these Books will give you good concept and as well as application of those.
THESE ARE SOME BUT NOT ALL TIPS FOR IITJEE PREPARATION
AT THE END ITS YOU HOW YOU DECIDE IT.
HOPE THIS WILL HELP YOU.
REGARDS
G NIKHIL VARMA