There are usually three forms: centralized review, decentralized review and interspersed review. Review after class should be dispersed and carried out frequently. Memory-based learning content, such as English words and Chinese recitation texts, should be repeated many times this year, so as to strengthen memory and disperse review. It is best to concentrate all the time on the stage review, and it is best to review it thoroughly at one time. Of course, centralized review can also arrange different courses (such as history, geography and mathematics) alternately, interspersed with review, so that all nerve regions of the brain can take turns to rest, and the work efficiency of the brain is higher.