Review bedding is the carrier between the knowledge arrangement system and the starting point of students' logical cognition. The textbook presents a static state of knowledge, and the organizer of the textbook only sets the test preparation questions from the perspective of students' cognitive characteristics and psychological laws in theory, striving to build new knowledge points and effectively assimilate, adapt and migrate with students' recent development fields. Understanding the exam preparation questions (reviewing exam preparation) is helpful for teachers to understand the overall system of teaching materials and provide important basis and reference for teachers to grasp the cognitive starting point of students' logical starting point.

Review foreshadowing is the adjustment and supplement to the original cognitive structure when students learn new knowledge. The process of students learning new knowledge is a process of self-construction. It is necessary to review the contradiction or vacancy between students' original cognitive state and new knowledge, so as to pave the way for communication and filling. When students have the ability of self-construction, there is no need for teachers to restrain students' development, and there is no need to prepare for review at this time. On the contrary, teachers should pave the way for review, guide and prompt students to review the original knowledge system plate, so that they can better find the corresponding knowledge plate for construction and induction.