Compared with junior middle school, senior high school learning has some new characteristics: (1) large amount of knowledge; The subject content is deep, the subject knowledge is abstract and generality is strong, need to master a large number of scientific concepts, formulas, theorems, laws; (3) Comprehensive and systematic, in order to understand or solve a problem, it is often necessary to comprehensively use the knowledge of various disciplines. High school students have to learn a lot of content every day, if it is not in order and priority, it will be scrambled, lost, could have learned things...