Ebbinghaus, a famous psychologist, said: The information that people come into contact with will become short-term memory after learning, but if they are not reviewed in time, these remembered things will be forgotten. Therefore, we should arrange the review reasonably according to the students' forgetting rules, and review reasonably and effectively at the end of each chapter and volume. Do what you can: after learning a chapter, you can string together the messy knowledge; Every time you finish learning a book, you can make students feel that the book in their hands has become thinner.

Educator Bruner believes that no matter what subject is taught, students must understand the basic structure of the subject. Mastering it makes it easier to understand and remember the subject content and promote the transfer of knowledge and skills. In review class, knowledge frame diagram is a good tool.

First of all, before class, let the students complete the knowledge review on the guide list and let them know what to learn in this class. Secondly, let the students recall the key words in class and try to build the knowledge network of this chapter with the students (Figure 4). Then around the core concepts of this chapter, students are guided to recall, sort out and train one by one, and through the analysis of daily life phenomena, knowledge is further integrated to stimulate students' subjective initiative in learning.