To write CET exam one of the biggest tips I'll want to give you is neither underestimate the exam as a very easy one and go for boards book nor go for very complex books as in JEE/NEET exam books. You've to stay in between with a smart mind. For books, I'll tell you to go with MTG CHAMPION for chemistry, solve it after reading government textbooks, same for physics but the book is Marvel Publications and for Maths you try to cover all the problems of government textbook ie solved examples, exercise questions and also the problem set questions, and then if you have time then go for some books like Target or Marvel. This was the way by which I has cracked my cet exam so gather confidence and believe in yourself. Also don't fail to write mock tests or particular chapter tests of cet to adjudge yourself aptly.

Best wishes. Thank you.