Mathematics must be enrolled in remedial classes, because after three years, all the knowledge learned before has been basically forgotten, and it is very useful to enroll in classes;
English and Politics According to your own situation, if you have a good English foundation, you can choose not to enroll in classes. Political lessons only increase your confidence, and you can also read books by yourself. Whether to enroll in specialized courses depends on the difficulty of the school. Famous schools such as Shangcai, Fudan, Tsinghua, Peking University and Nantah will definitely enroll in a class, which can accurately locate the review direction.
The way to test whether to sign up for classes: find the school reference books, read them, and then find the real questions for a year to see how it feels. Sign up for a class if you don't get a few points in the exam, in case something goes wrong in the professional class.
Most of the remedial classes in public courses are on holidays, so you can choose them yourself, at all stages. The earlier the specialized courses, the better. Don't wait until 10. Many people think that specialized courses can be reviewed in the next three months. This is a misunderstanding, so we must start early.
As for online schools, I think we can still try. Before signing up, you should experience the online school model of the remedial class to see if it is clear and smooth. The CD-ROM course in the public course is also good now, saving a lot of time.