The focus of the junior high school exam is probably in these aspects: 1, function type, accounting for about 15% of the total score of the senior high school entrance examination. Function problems are difficult for students to learn, especially quadratic functions. 2. Algebraic formula, fraction and quadratic root simplification, these knowledge points are the focus of junior high school mathematics learning and the basic knowledge of our mathematics learning. Among them, factorization and understanding the relationship between factorization and algebraic multiplication and fractional operation are the difficulties for students. 3. Mathematical geometry problems. For example, geometric proof questions and the calculation of line segment length and angle, the nature and judgment theorem of special quadrangles, the nature and judgment of tangents, the understanding and application of basic properties in circles, the positional relationship between straight lines and circles, and the calculation of line segment length and angle in circles are all important and difficult points in learning.