Generally speaking, you can't do it. You have taken all the mathematics in the country, but only the knowledge of Grade One is not enough. For example, a function problem is monotonous and too complicated to be seen at all. We can only use derivative to solve it, no, no, no, and finally send an elliptic hyperbola+vector, which is even more troublesome. You can only do one set of paths, and you can only be in a daze at other times.

However, if you really want to go, just tell me in front of your old class and focus on increasing your knowledge. Of course, if you know everything, that's another matter. Make it clear to the old class that you can go if you register in time.