Dear Jayati, 

Nice to see your zeal and spirit .. this is the perfect time for the IIT preparation.. I will suggest you study seriously whatever is going onin your school, tuition and coaching etc... 

I am giving you a list of good books check it out : http://www.askiitians.com/Important-books-iit-jee.aspx 

Please feel free to post as many doubts on our discussion forum as you can. If you find any question Difficult to understand - post it here and we will get you the answer and detailed  solution very  quickly.

We are all IITians and here to help you in your IIT JEE preparation.

All the best.

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Regards