Icwai inter-study material

Hello Everyone,

I am CMA inter student and my attempt is due in December 2014.

So i geting confused wether do study from Institute's Study Material or should i buy any authors books from the market?Which one will help me more in preparing best for the exam.Please tell me for all subjects.

In addition to that i would like to know wether there is any book available in the market for past exam questions with solution for all subjects.

Reply is Awaited.