2, you can try to hire a tutor or something, preferably one-on-one explanation, and ask the teacher if you don't understand, so that progress will be faster.
3. Try not to lose points for the questions you can do, and try to add points for the questions you can't do.
4. recite the formula, don't be afraid of trouble (the formula is not rote learning, just recite a formula and do a corresponding question, so the formula is easy to recite).