(2) I have met similar students and analyzed why they are like this. I think when you were a child, you could always be the first in your class in math. This shows that you have the ability to learn math well and have a good foundation. Your math ability will never be worse than others. You must first affirm yourself.
(3) From junior high school to senior high school, your math scores are only above average or below average in your class, but your physics scores are in the top five in your class from junior high school to senior high school. That's because most of the math skills you learned in primary school are used for physics in junior high school and senior high school, and your thinking ability is biased towards physics. Then over time, a physical thinking process is gradually formed in your brain, that is, a physical learning thinking is formed. Physics and mathematics are closely related, but when studying physics and mathematics and doing these two subjects, the methods and ways of thinking are different. So when you study and do math problems, you will unconsciously use physical thinking methods to solve problems. In this way, if you don't have mathematical thinking methods to do problems or learn mathematics, your math scores will drop.
(4) I suggest that if you want to learn mathematics well, you must first master a method of learning mathematics and form a mathematical thinking. At the same time, you should distinguish it from physical thinking. To do that topic, you should use the thinking method of the topic, which is what we often call "getting into the state" I think if you can do this, your math will improve by leaps and bounds.