I have been using concepts of physics since last two years and let me say the books are the best books for any beginner for physics and competitive exams. These books are must have books for every physics lover in 11th and 12th grade. The books are written in very simple language which helps to understand the concept properly and covers each and every type of concept.
Coming to the questions the books have extremely awesome questions starting from simple level and taking you to the advanced level.
Each chapter in the books has three types of questions mcq ( single correct ) , mcq( multiple correct) and the subjective one.
Now coming to the most important point and the most important content of the book which is the solved examples of these books. The solved examples are "GOD EXAMPLES" for any student . If you read the chapter carefully and then read the solved examples you will really appreciate the content and you will be ready to solve the unsolved examples .
I recommend these books to every physics lover studying in grade 11th to refer these books and solve the books sincerely.