The original classroom pays attention to the comprehensiveness of textbook knowledge points and the effectiveness of exercises, and strives to further improve students' mastery and application of knowledge points through appropriate explanations. The content is closely related to the teaching material, covering a wide range, and has strong pertinence and practical value.

Excavate the original ideas from the teaching materials to get the variant questions of examples and exercises, and the original questions obtained from the teaching sentiment of variant questions learned from the senior high school entrance examinations in various places are largely reflected in this series.