Difficult. It is difficult to use Wan Wei's large and small volumes in the seventh grade. Wan Wei's small volume is the basic topic, Wan Wei's large volume is the promotion topic, and both the large and small volumes have weekly tests and special topics. The questions are more comprehensive, and the size of the paper is simpler than the required exercises. If the child is above average, he can choose to practice. Many topics are classic. Wan Wei's large and small volumes are aimed at the difficulty of the senior high school entrance examination questions, combined with the content and knowledge points of the teaching materials, and imitated the characteristics and structure of the real questions, and made some extensions and expansions.