Secondly, pay attention to the vertical connection between knowledge points. Vertical connection is to examine the process and development of educational events from the perspective of time. For example, the system of selecting scholars in the history of education in China has experienced the continuation and development of the imperial examination system, the Nine Grades Zhengzhong system and the imperial examination system. These systems are separate and closely related, so we should pay attention to this vertical connection in the review process.
I hope I can help you.