Learning is a very complicated process, and the results are accumulated by a little effort every day. Only by enduring boredom and even finding pleasure in mathematics and physics can we effectively improve our grades.
If you don't know, then remember: you must listen to the teacher! Don't think you know everything, and don't think your teacher is not good. After all, education is for people to eat. Don't ignore any requirements of the teacher. Teachers are mainly responsible for learning, and the starting point of each requirement is for academic performance. If you listen carefully and work hard, your grades will certainly improve gradually. Come on!
If you are really not interested in learning, you can consider learning a skill, so it won't be bad to enter the society in the future ~