CMAT is a computer-based online test of three hours duration.there are four sections such as Logical Reasoning, Quantitative Techniques & Data Interpretation, Language Comprehension and General Awareness.
Here are some of the books you can prefer:
Quantative Ability by Arun sharma
CMAT Common Management Admission Test Guide by RPH Editorial Board
CMAT Common Management Admission Test by G K P
The Pearson Complete Guide to the CMAT by Showick Thorpe