Brilliant book with very good questions. Best book for IIT JEE aspirations. The less of difficulty of question is from easy to difficults. In the beginning the question are easy and are mainly based on formulas application after that conceptual question comes in which concepts are more important than formulas. 2 to 3 time revision of this book will take your physics upto the JEE ADVANCE. If you don't get the answer after trying it for 1 to 2 time mark that question and see the solution or consult the teacher. Next time when you will revise that chapter you do that questions which you have marked not all the ones. If the book is followed properly the results are guaranteed