Li Yongle system, clear thinking, but slow pace, suitable for students with basic knowledge, Wu Zhongxiang is a little faster, suitable for students with solid knowledge. Li Yongle Basic Three-Piece Set and Wu Zhongxiang Basic Three-Piece Set are math tutorial books for postgraduate entrance examination, which correspond to the online classroom videos of Li Yongle and Wu Zhongxiang respectively, including the review of the basic articles of the whole book, the passing of 660 basic math questions, and the analysis of the basic articles of mathematical real questions over the years. The difference between the two is that Li Yongle system, with clear thinking but slow pace, is suitable for students with general foundation, while Wu Zhongxiang has a fast pace and is suitable for students with solid foundation. The national unified entrance examination for graduate students refers to the general name of relevant examinations organized by the education authorities and enrollment institutions for the selection of graduate students.