High school should develop arts and sciences in a balanced way. First of all, junior high school should have a little foundation and rich common sense (a lot of knowledge that you think is not common sense is difficult and biased, but common sense in the eyes of teachers). If you have nothing to do, just look at the map, some related programs on TV, lecture halls and archaeology. I have a wide range of personal interests, so I usually read a lot, so it is always right to read more. The most difficult thing in high school should be physics. I am a textbook and a teaching aid. I listen in class and read reference books after class. If I chew it thoroughly, it will be very strong. Chemistry is a bit "literary", and there are many bits and pieces of knowledge points. It would be nice to have time to summarize and classify. Biology, I can't say. Read the book several times if you have nothing to do, just like reading a liberal arts book. Political history must be memorized, and if it can be memorized, it must be memorized. You can recite it after one class, learn it on the same day every day and review it the next day. Don't memorize before the exam, remember to forget it quickly. Geography depends on your common sense. Interest is very important. I have been very interested in geography since junior high school. I posted two maps on the bedside and looked up and saw them. I remember them. You must accumulate more English after class. To be sure, New Concept English is really good, and what the teacher said in class is not enough to get high marks.
I can only say so much at a time. I hope it works for you.