this is class 10th CBSE PW science question bank it contains vast variety of questions
also
1) competency based questions
2) myth buster
3) real life application based question
4) mnemonics for easy learning
5) topic wise questions
6)flow charts
7)PYQ

if you will practice this book from starting your all the concepts will be cleared and there is sufficient questions that you can practice

it is good for your pre boards and half yearly because it contains topic wise questions

refer to this book for scoring good marks in boards👍😉