You should have a good attitude. Senior three should look like senior three. There is still some time before the college entrance examination. You must seize this precious winter vacation, be targeted, find a topic that can get points, and then practice repeatedly to determine the points you should get. Don't aim too high If the foundation is so poor, the effect of self-study is not very good. You'd better hire a tutor. Personally, I think it is better to invite students. Step by step, and finally all the undergraduate courses are available.