First of all, you have to memorize the definitions in the math book. This is part of the proof. Second, we should remember some formulas that are easy to appear in the proof questions, and review the previous exams to see the rules. Third, do more questions and understand the answer logic of doing proof questions. If the writing is messy and the logic is not smooth, the teacher who corrects the paper will change the score to zero without looking. Just these three things, in fact, mathematics is very simple.