It's still difficult. Make a good study plan and be prepared. You can teach yourself, but a self-taught person must meet several conditions.

First, solid basic skills; That is to say, you are good at arts and sciences and have strong self-study ability.

Second, it has strong binding force; Needless to say, this.

Third, there is plenty of time.

If you can't fully have these three points, I suggest you sign up for a class and see what you don't have!

Personally, I think it is necessary to register for the civil service class. You can learn a lot of things that you have never understood and confused, but you should have a systematic review plan. You can apply Hangbo's three-round review method. Doing more questions is a key step, but if you don't do it well, you just don't do it. The intensive teacher of Hangbo often teaches us how to do a math problem thoroughly, which I think is very practical. If you don't have time now, you can sign up for a closed remedial class, because the closed remedial class is intensive training, and the teacher follows your idea of doing the problem. People who feel pressed for time are definitely good, and people who have no plans are good choices. Come on!