Hi gauri b
Fitst I will suggest you to join any coaching classes.Because as you are preapearing for IIT JEE then you will face a tough comptition.
coaching classes can guide in a better way. you can join online coaching classes from your home.
click here for more details about the packages in Askiitians .com :
Just stay calm and focus on understanding rather than mugging. Be regular in class and stay with concepts.Refer good books and always try to solve problems from magazines like MATHEMATICS, PHYSICS, CHEMISTRY TODAY atleast once in two months.
For BOOKS you can check this link
Hope you give your best.
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 gauri b.