See MET is undoubtedly an easier examination compared to other Masters entrances in Engineering. There are no such separate choices for MET, but it would be better for you to consider the GATE books as references. MET will not be as tough as GATE, but if you can prepare for GATE not like Toppers but atleast like Average students, then also you will have a very high chance to qualify the MET with good ranks. So considering the materials of GATE will be a wise choice for you. The previous year papers of MET aren't released by the University authorities, so you can't get those, but you can estimate, the question type to be alike with the easy questions coming in GATE.

For GATE CSE books you can consider the link below:

https://engineering.careers360.com/articles/what-are-best-books-for-gate-cse

I hope this helps. Wish you a great eve!