A popular math problem book in China is the talk of the town. Earlier this month, a new math problem book was released by a famous online math instructor, and it is said that even students who were not good at math have improved their math scores significantly after solving the problem book. It is sold in elementary, middle, and high school levels of difficulty, and includes short math cartoons to keep students focused and not bored while studying. The internet math instructor who created this book was already famous, but after releasing this book, he became even more famous and attracted more students. However, there is also controversy. As evidence of this, you can see similar types of problems with only the numbers changed, although some people say that it is common for math problems to have similar problems.