In my experience, the key to learning mathematics well is to listen carefully in class and follow the teacher's ideas. Another point is that you must take notes, remember the typical questions the teacher said in class, and often look through your notebook, especially before the exam. You don't have to review the textbook (provided that all formulas and theorems have been memorized), but you must read the notebook. When doing problems, we must always think about the combination of numbers and shapes.

For the math exam, the following methods can be adopted.

Conventional method? Step by step.

Special value method?

Number-shape combination

Transformation between function and equation

For questions without ideas? What related knowledge did you learn first? Then open your mind and do the questions.