It is not the book for conceptual understanding, only for the question making purpose. In this book only terms or topic of 11th and 12 th are given not described or explained properly.
Good for question making purpose. If you want to learn or understand any topic then please don't buy this book. I had bought this in only ₹627. Not so costly but money is money. It is better to read ncert books of 11th and 12th.