Concept class: if it is a new class, abstract the essence of mathematical concepts from the things around students and enhance students' interest; The teacher gives an example, and then ask the students to give another example to strengthen interaction;

Exercise class: It is necessary to thoroughly investigate the basic situation of students and the opinions of most students, design topics with reasonable difficulty according to the students' learning foundation, and supplement and explain the necessary core concepts (concepts that students do not understand themselves must be explained repeatedly in the exercise class);

Review class: first outline the knowledge framework, then let students discuss and express their opinions independently, and then explain the classic motif; Make a reasonable review plan according to the situation of most students.