According to my experience, I suggest that you sign up for only one English remedial class, and the one in New Oriental is good. If you have no confidence in math, you can report it. If the foundation is ok, don't apply. This is a waste of time. You might as well do more problems yourself. Now the postgraduate entrance examination materials will help you summarize the questions. Where you go, the teacher just talks about the topic. There are not many extra things, so you can hardly use them in the exam. All the knowledge and materials used are here.