Hi,

The NMAT by GMAC guide is one of the best source to study from due to a number of reasons. The guide provides basic concept which are easy to understand. The content and the questions are very similar to that of the actual NMAT examination. The guide includes a lot of practice questions and solved examples for every topic for better understanding. You can also solve the free mock test NMAT by GMAC which will prepare you better for the NMAT exam. In addition to that, you can also prepare from the paid mock tests to know how much you've improved.

I hope this helps,

All the best.