1, topic difficulty: the experimental class is difficult and the number is small. There are many difficult problems in the classics.

2. Class system: The schedule of the experimental class is not completely in accordance with the curriculum of the textbook, and the knowledge points will be processed and integrated for the second time, and chapter exercises will be designed. If a unit contains too many knowledge points, it will arrange "practice classes" in due course. The textbook schedule is arranged in the middle of the class, one lesson and one practice, and each unit has staged literacy improvement exercises.