I had used this book in class 9th and 10th both and this has actually given mew great results. This book contains the very essential notes that you require to study before any chapter.Then it has proof of every theorem you have in syllabus with alternative methods. its illustrative examples are tricky and very useful for final examinations.through my experience I can say that if you have solved Rd Sharma once then you can easily score 80 above out of 90. Its questions are conceptual and help in building concepts very effectively .