Your former math teacher was very poor, it should be said that his morality was poor. Moreover, teachers are also responsible for students' poor exam results.

Of course, for you, you can only find reasons from yourself and work hard. I also make a small suggestion, hoping to help you:

First of all: overcome the fear of math teachers and math. It's hard to imagine that you are afraid of math, but you can learn it well. I'm sure you know. Therefore, overcoming this psychological obstacle is the first hurdle you must take. Generally speaking, the teacher's personality is still relatively good, but your previous math teachers are only a few. Try to communicate with the current teacher, raise your doubts and express your wishes. I believe that your desire to learn math well and your enthusiasm for knowledge will definitely impress him ... if nothing happens, you will get great help from him.

Secondly, regardless of any subject, interest and achievement are actually directly proportional and mutually causal. The deeper your interest, the better your grades and the stronger your interest. Take my previous example of improving my English scores: my junior high school English scores were very poor, and I only passed in an unexpected situation. In order to improve my English, I did a lot of questions, but all of them seemed to have little effect, and my resistance to English became stronger and stronger ... Later, I got 66 points in an exam (total score 150), but this exam taught me how to study. I studied the test paper for two weeks, and I found out all the things I didn't understand, seemed to understand, simulated ambiguities, familiar words, half-baked words, completely unfamiliar words, and so on ... I got 108 in the next unit exam. With this successful experience, my interest has come and my grades are getting better and better. At the end of the senior high school entrance examination, English 133, and college entrance examination 123.

Seems a little boastful. I mean, I can do it. I'm sure you can do it. Of course, this requires your determination and perseverance. As the motto of Harvard Library says, "No one can succeed casually, it comes from thorough self-management and perseverance."