Self-taught three written tests and one support are enough, and there is no need to apply for classes. First of all, the cost-effectiveness of applying for classes is very low, because what the teacher says in class is actually worse than what the textbook says. The problem of memory still depends on yourself, and the same effect can be achieved by brushing the questions while watching online classes.

"Three Supports and One Support" is a policy implemented by graduates at the grassroots level, which means that after graduation, college students go to the rural grassroots level to engage in supporting agriculture, teaching, helping doctors and helping the poor.