Clear knowledge system: northeast normal university has a clear knowledge system of junior high school mathematics problem solving. In terms of topic selection, in addition to the topics of junior high school entrance examination, the topics of unit, monthly examination and entrance examination of all grades are also selected, and the ranking of topics is from easy to difficult, which is conducive to improving students' academic performance.

Comprehensive explanation of knowledge points: Northeast Normal University's Junior High School Mathematics Problem-solving Exercise Book gives a comprehensive explanation of knowledge points, which not only provides students with a model for learning and mastering standardized problem-solving methods, but also provides teachers with examples needed for teaching and evaluation. The in-depth study of new courses and new topics and the high-end combing of new situations and new thinking will benefit teachers a lot.