If you teach yourself, it depends on your comprehension ability. Parents are advised to take their children to the Book City to see which one suits them. Students have a strong ability to accept, and they can directly absorb it like ordinary textbooks, which makes it a little more difficult, which is quite good. This is a difficult book. Teaching students in accordance with their aptitude. The Olympic mathematics reading book is based on the daily exercises of the Olympic Games. In fact, this book is relatively simple.