Mainly from three aspects, one is to let children have a complete knowledge system, and there is an overall framework between knowledge. No matter what subjects, the previous knowledge points are interrelated, and a complete framework is also convenient for extracting knowledge points when doing problems. The second is to improve the ability to solve problems. Last summer vacation, the children went to the excellent teacher opposite their home. The teacher would use the ladder to teach and split the knowledge points, so that the children did not have any learning difficulties, and the correct rate of the application questions in the last two pages was higher than before. The third is to consolidate the review in time. People have memory curves. If they don't consolidate in time, they will slowly forget and review the knowledge points as a whole, so that they won't forget all the knowledge they have learned.