1. You should read more textbooks. Books are the most important thing. Generally speaking, as long as you explain the knowledge in the book clearly, no matter how the questioner tests you, you can cope. The exam is always like this, and its prototype is always the knowledge in books. No matter how difficult the topic is, we can break it down into several small questions, which are basically from books.
2. recite the formula, this is definitely going to pass.
3. Usually do the questions in moderation, not too much, and certainly not too little. If you do less, you may not be familiar with doing the questions during the exam!
If you don't understand anything, ask the teacher, prepare a corrected book, copy all the wrong questions, and then do it often. Stick to it and your grades will definitely rise!