I think it is the best mathematics book for class X students.This is because it have many topics which other books don’t have.It also have many solved examples which helps a student to understand the topic clearly and after that it have many questions which the student had to answer by which the student knows how he/she had understood the topic.I personally had used it and I would say that it had changed my views towards mathematics. It also had the previous years CBSE board questions which is much helpful for the students.