without going for coaching when i am in 11th and in 12th how can i prepare for iit examination?

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 :
 www.askiitians.com/packages.aspx

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

http://www.askiitians.com/Important-books-iit-jee.aspx

Hope you give your best.

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 All the best gauri b.
 
Regards,
Askiitians Experts
Badiuddin