This course is taught exclusively by Song Yanping, a science and engineering tutor. Explain the key points, difficulties and test sites of the textbook in an all-round way, teach students to understand and master the basic concepts, principles and methods in the textbook, guide students to master the ideas and methods of combining real questions with typical test questions of famous schools, and further improve their test-taking ability. At the same time, grasp the test sites from different sides, and then focus on explaining, narrowing the scope of the test, and grasping the direction and thinking of the test more accurately.