Hello, when I first entered high school, the topic was relatively simple, with fewer knowledge points and fewer internal connections between knowledge points, so it was easier. After a long time, with the increase of difficulty, the flexibility will also increase. I suggest you don't leave too much. If so, take time to remedy it immediately and review more on Saturday and Sunday, otherwise it will become more and more difficult. No, ask the teacher if he has reviewed it. A solid foundation means that you have made progress.