In order to prepare for MHT CET you can refer below books for your preparation

Chemistry Book from MTG Editorial Board

MARVEL for  Mathematics

Complete study package from Disha Experts

Pradnya for Physics.

According, to the new changes questions will be application based in MHT CET exam and there will be no negative marking. So, you should attempt complete paper. Difficulty level of the exam will be par to JEE Main. 20% weightage will be given to class 11th and 80% weightage will be given to class 12th. So, you should give importance to class 12th.

All the Best!!