In fact, primary school mathematics is very simple, some knowledge is extrapolated, and complex knowledge is just a combination of simple knowledge. You should learn to simplify complex knowledge, and some knowledge will be solved when new knowledge is transformed into old knowledge. Now you are a junior high school student. I am a primary school teacher. Seeing that you like physics and chemistry very much, you must be a child with abnormal thinking. Believe in yourself. Give you some advice, read and reread, and you will learn a lot from reading.