What you need to know is the subject requirements of all the schools you can apply for. You can ask your brothers and sisters. They can give you some advice because some of their classmates have been tested by their brothers and sisters.
Then choose the school that suits you according to your study.
Then take this school as the goal and lay a good foundation from now on.
It should be that English and politics will not change, nor will the postgraduate entrance examination. If you can't ask the requirements of your relevant school, then start preparing from these two courses. I believe it can't be wrong.
As far as English is concerned, it is mainly reading, so the amount of words is very important, and writing also depends on the accumulation and reading of words. As for listening, as far as I know, there is no listening in Guangdong, and other provinces don't know.
Politics, as far as Guangdong is concerned, has been tested in Allen (Higher Education Press) in recent years. I don't know which province you are from.