Question: Were you poor at math in junior high school? If so, it means that you have not laid a good foundation in mathematics.
Suggestion 1: Don't lose confidence in yourself. Everyone has similar IQ, and there is still a long way to learn in the future. It is not known who will die if you keep trying.
Recommendation 2: Adjust your mentality. If you are poor at math, you must realize that it is a protracted war to improve your math scores. Don't expect yourself to achieve results in a short time, but be prepared for a protracted war.
Suggestion 3: sorting out the wrong problem sets and previewing before class are all common good study habits. There is no need to doubt, just stick to it.