hi everyone!
I have seen many questionsabout books for IIT in goiit.com. I think you will find this link useful
http://educationtimes.com/educationTimes/getArticleDetail.do?articleid=200903042009030413164618542b656d9§ionid=170§ionname=IIT-JEE
Also, educationtimes.com has info about chapter wise weightage in IIT.
Hope u find it useful