First, you must follow the teacher in class. To prepare a notebook dedicated to taking notes, in addition to the knowledge concept of the teacher's blackboard writing, there are also examples given by the teacher. If the topic is novel or difficult, it is best to mark the problem-solving ideas and important operation rules beside it. This will not only deepen your understanding of concepts and problems, but also help you review in the future.
Secondly, we must preview and review well. It is necessary to review the past and learn the new.
Furthermore, prepare a book to sort out the wrong questions. If you don't have much time, you can cut out the paper and paste it on your notebook (except for math, the wrong questions of physics and chemistry are also sorted out in this way). Use the time of self-study in the evening, or you can look at it at home on weekends.
Finally, ask if you don't understand. Ask your teacher or classmate. Anyway, if you have any questions, you'd better not put them off until the next day.
I hope my ideas will be helpful to your study. Come on! But remember to stick to it ~