Your question is concise and clear, and scolding a teacher is generally considered a bad behavior, and the school will give you a warning, a demerit, or something like that. I have my own group of classmates, at least junior high school students. Middle and high school students should also be sensible in the impression of ordinary people, after all, serious criminal offenses, 12 years old have to take responsibility for themselves. But, after all, you are still a minor. It is not excluded that narrow-minded teachers will not forgive you, but ordinary teachers are still open-minded.
On the surface, you apologized in writing, but in fact your attitude was not sincere, and you did not reflect deeply. From your sentence "But in fact, the way we deal with abusive teachers in school is to leave and go home for a few days", "This matter is also my fault, I really shouldn't be scolded, and if you want to scold, you can't let people catch it", you think it's not a big deal to insult the teacher. Secondly, the conflict between you and the teacher is not the first time, it is many times, and you yourself feel that there is a mistake, but you also say that "he is working in the factory before he became a teacher for the first time, and he may not have any teaching experience and coordination ability", based on the above analysis, your apology may not be sincere, and your attitude can be perceived by the teacher.
The conflict between you and the teacher is not a day or two, in your opinion, it is the teacher's indiscretion, but from other feedback, your parents do not agree with your choice, you can only go back to the original class. As a minor, you don't have many options.
One, you can convince your parents to help you change shifts;Second, you can impress your homeroom teacher with your sincerity and make him accept you again;Third, use your actions to impress the head teacher;Fourth, from now on, be a student who is liked by teachers, be a child who reassures parents, and be a companion who makes classmates look up to you.