Well, if you are in junior high school, it's too late to work hard now. You can recite all the relevant mathematical formulas, then do some basic problems and then do some complex problems. Remember the definitions and formulas in physics and do the questions with understanding. Chemistry, I actually think this thing is not too simple compared with high school. The teacher asked me to memorize everything. Generally speaking, these things can be memorized in junior high school. The key is whether you are serious or not. Senior three dogs tell you that today's children are simple and must study hard, otherwise you will learn nothing in high school.