Sir, I want to totally be prepared for International Olympaids, i am in cl- 11, what should i do and which study materials do you preferred??

Dear Satyam,
As per to me you must see the book of International Olympiad Of arihant for maths,
and Physics olympiad of the same for physics.
you can also have a look at Pre College Mathematics.
its also nice.
i hope you appreciate it.
Regards.