Not worth it. According to the information in the inquiry book "Ping Ji Outline", the material of Ping Ji Outline is selected from the geometry questions at the end of the senior high school entrance examination, the geometry questions in the mathematics competition and the geometry questions circulating on the Internet in many places in China. It is a book that carries out systematic mathematical thinking training and actual combat training from dozens of books, many mathematical websites, forums, post bars, mathematical groups, WeChat official accounts and other tens of thousands of geometric problems, but it is not suitable for high school students to read and belongs to junior high school.