Although it's not your problem, I want to give you a suggestion. Finally, don't sign up for math class. There is too much content. If you don't have a good foundation in class, you will generally fail to keep up with the teacher's ideas. And even if you can keep up, a lot of content will be forgotten later.
My suggestion is to download the video of next year's math lecture online and watch it again and again. If you don't understand, you can listen again and again and slow down. Only in this way can we have good results and save money. And the time can be set by yourself, so you don't have to delay listening to the 10-day postgraduate course.
The content of math class is basically the same every year, and the new year will only be mixed with a few real questions from last year. So don't worry. It's enough to listen to the lecture that I forgot to pay.
Combined with my own experience, I didn't remember anything in the postgraduate entrance examination class, wasting time and money, but I went to give lectures later. Listen for a while at noon and every night 1-2 hours before going to bed, so as to understand the knowledge easily and not delay the best self-study time during the day.
I hope it helps you.