High school history is different from junior high school. Junior high school pays attention to memory, while senior high school pays attention to understanding. The arrangement of high school history is first of all notes. The teacher will tell you the key points and difficulties in class, so you must arrange them. Secondly, at the beginning or end of each unit, the teacher will tell you the content of this unit, so be sure to sort it out, because this is the clue of this unit and the basis for remembering the content of this unit.