Only focus on the study of senior high school entrance examination, college entrance examination and PISA. Specially-assigned people collect materials suitable for propositions in real time, establish a huge database of propositional materials, and develop more than 200,000 high-quality original topics every year to ensure that each book does not focus on topics.

Wan Wei's materials are new, the situation is true, and there are many problems in a problem. Use basic questions, expand questions and innovate questions. Assist the teacher to arrange homework in layers and prepare for the exam efficiently.