4 maths it is good but it has more topics than required 4 iit
but u have to do high level problems
but for physics n chemistry itz just the basic
u have to do a lot more
my advice is that first grasp that syllabus then later u can do other
i din do so
so now im suffering
hope it helps you
http://www.krishnamurthyiitacademy.com/articles.html
see this link
it may help