Then, in class, you must listen carefully, follow the teacher's ideas, follow the teacher, follow the teacher, and don't refuse to listen or insist if you feel that you won't or it will be difficult. There will be many questions in the process. If you don't understand, you must ask! ! It is best to consult the teacher and stick to it, so as to improve.
This is my own similar experience, but I am a sophomore. As a science student in high school, biology is also very important, but I didn't pay attention to it and didn't listen when I was a freshman, so I fell behind a lot. I listened carefully when I was a sophomore. Although I didn't understand it, the teacher analyzed the topic when he was talking, which would supplement and review a lot of knowledge, so the biology gradually improved.
Be sure to persist!