As a graduate student, I can say a few relatively objective words. Niu Er's teachers are generally great. Of course, I don't like all the teachers, because the class style is really different. Fortunately, there will be several teachers in one class, so I don't like this teacher's style. You can try another one. Of course, in any case, teachers' teaching attitude is very good. After all, we grade their skills and teaching attitude once a month, which should not be available in ordinary schools. I think it's good. At least we can complain about the teacher's teaching, and the school will respect some of our ideas.