Sir please give the name of good refreshers for class11 specify separatelyfor physics , organic , inorganic, physical chemistry and mathematics. Also tell how to start preparing for iitb.

Dear Student,

You Should be active and regular in your coaching institute. Solve the sheets and revise the topics on the on the regular basis. And most important, keep clearing your doubts.

For books you can refer the below link:
http://www.askiitians.com/iit-jee/advanced/important-books.html

Thanks.