1, subject coverage is more comprehensive: Wan Wei's teaching assistants cover mathematics, physics, chemistry, geography, biology, politics and other subjects with more comprehensive contents, while one teaching assistant mainly explains one or several subjects in depth, with relatively less knowledge coverage.

2. More topics with higher quality: There are relatively many topics in Wan Wei's teaching assistants, including a large number of examples, exercises and simulation questions, which are suitable for improving the subject foundation, while the number of topics in one teaching assistant is relatively small.