Some people say that the saddest thing in life is not being despised, but being ignored. Maybe he's right, but you can't keep looking at it that way.
On the other hand, since you are left out by the teacher because of your poor academic performance, show your performance to the teacher.
Mathematics is not so difficult that everyone can't. As long as there is no college entrance examination, it is not too late.
From now on, reflect on the reasons why I didn't learn math well. Since politics and history can be done, there is no reason why mathematics can't be done.
I am now a senior three, and my learning method is to accumulate typical exercises. When the teacher is talking, I will write it down, so the efficiency of attending classes is much higher than that of simply attending classes. After a period of time, you may find yourself forgetting some topics, but in fact, the teacher said it in class, so you can find out.
You have to understand that all the Excellence and attention now are untrue, and it can only reflect your ability on the one hand.
The ultimate goal is the college entrance examination and university. At that time, you will find that what you are concerned about now is false, and only your ability and score are true.
If you can't recite it, force yourself to remember it by writing. This is a way for me to learn. You can also try.
The most important thing to improve your grades is not the teacher's cooking, but your own efforts.
Please, you should be able to do it. As long as you think you can, you can succeed!