Enjoy your school life ...this time never came back...u may  change your decision when u came in 12 class...this time is priceless enjoy it fully

Hi,
It's a good thing that you started thinking about your future.
For iit you should study hardly.after class 10th when you continue your all science subject then not only prepare for those exam. You should know in details and mostly focus on mcq because it's a very difficult thing.
You should prepare like this:
1. Understand the structures of the Main exam.
2. Use official mock tests.
3.Use questions papers from past exams.
4. Buy test prep books:Test prep books, brochures, pamphlets, and more are available at academic bookstores
5.Spend the most time studying your weakest topics.
6.Time yourself as you take practice tests.
7.Take care of your physical needs on test day.
Thanking you..