Some of the references you can consider for preparing MAT exam are

• Study package for MAT by Arun Sharma
• Mission MBA MAT guide by BS Sijwali
• Complete guide for MAT by Deepak Agarwal
• MAT score accelerator from Deepa publishers

Apart from considering books you should also practice previous papers and review the following points :

• Go through the MAT exam pattern
• Read thoroughly the MAT syllabus
• Pick out your strong and weak areas in all the sections
• Improve on your weak areas and monitor the improvement regularly
• Take as many MAT Mocks during your MAT exam preparation and do the analysis of each Mock. Without analysis of Mock, attempting a mock test may not be useful.
• If you are weak in VA & RC, reading different articles and novels, conversing in English with friends and even watching English TV series and movies will be helpful.

The difficulty level of CMAT & MAT Entrance Exam is less than CAT Entrance Exam, With little hard work you can crck it. Here are some preparation books you can prefer for CMAT, MAT Exam.

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

MAT Preparation

Mission MBA MAT Guide: BS Sijwali and Tarun Goyal

Complete Guide for MAT and Other MBA Entrance Exams: Deepak Agarwal

MAT (Management Aptitude Test) Entrance Exam Guide: R. Gupta

Good Luck!