However, if I were you, I would choose to take the self-study exam, because many institutions are unprofessional now, and they are just cheating for postgraduate entrance examination. There is no need to enroll in classes at all, but only if you can control your own study and learn by yourself well.
There are many teaching resources on the internet now, which are also very good. There is absolutely no need to spend so much money to find some unprofessional teachers and informal institutions to attend classes. Finally, it's a complete waste of time. I don't listen at all. Online courses are also very comprehensive, all taught by professional teachers. Some are free, some need to spend a little money, but it is already very cheap compared with the price of the organization.
Therefore, from my personal point of view, I can make full use of online resources for self-study.