Autonomous enrollment, as the name implies, is independent enrollment of universities. Universities give preferential treatment to outstanding students through certain examinations, which reduces the burden of college entrance examination, but it is also a means for universities to grab students.

The number of places can be allocated by the school or registered by yourself. The school has forms, so the discount is bigger, which means it is easier to recruit.

Generally, after-school exams are exams. There is no process. Every university is different. Some universities have interviews after written examinations.

I still suggest that you lay a solid foundation in your freshman year. The college entrance examination is the most important thing. It's too early for you to do it yourself. To tell the truth, it's impossible to get ready.

If you really want to prepare, you must think about what university you want to enter. For example, if you are rich, then math is particularly difficult (I have participated in it) and English is OK, then you will know where your focus is. If you are math, you should take part in more competitions.