1. I don't know the knowledge. That is to say, when I saw the question, I didn't know which part of the exam it was, but I knew that part of the exam and I remembered it vaguely. Try to remember this kind of reading textbook notes.

2. I don't know when I see the problem. I know the part of the exam, but I get stuck when I think about it, and I won't think about it. This is to do the problem, consciously clear your mind on the problem that you can't do, and you can do it next time if you make a mistake.

3. sloppy. Slowness is actually caused by the jump of your logical thinking in that part. Try to sort out your own thinking process in your usual practice.

Usually, exam results are just exercises. If you do well in the exam, it's nothing, because you remember. It doesn't matter if you didn't do well in the exam, which means you still have something to remember, which is a good thing.