As for the training cost of Level 4, first of all, the training cost of Level 4 is different. There is no standard answer to this question. Everyone's study time is different, the economic situation is different, and it also involves buying books and whether to enroll in classes, so there is a big difference. It is suggested that the selection of four-level training institutions can be considered from several aspects:

First of all, the teaching staff is the last word and hard indicator;

Secondly, excellent training institutions will not only provide necessary preparation materials, but also prepare corresponding review materials for students according to different preparation stages such as foundation consolidation, system strengthening and model test sprint.

There is also a suggestion, we must choose some larger institutions, so as to ensure word of mouth and supporting services.

As for the question of whether to apply for classes, I suggest considering it from my own situation:

1. If you are not good at self-study, I suggest you choose a reliable four-level training institution for systematic study.

2. If you have a good learning ability and want to save time for self-study and review efficiently and emphatically, I suggest that you also report to a four-level training institution for systematic study.