Look at what you said. I think you are a perfect person. You must study very well, right? You will face this problem many times, or you will be asked to do it again, so there is no need to test you. You need not be afraid of such a problem. It is very important to keep a clear head when doing math problems. I've faced this situation before, and I've done it. I usually encounter this kind of problem when I do the big questions of reviewing materials. At this time, you must be careful, and you must not be careless to understand every detail. It's best to think about it and read it again and again. Math problems? There are always few types of questions, which are within our scope. So you should remember that the problems you have done, including the type problems, must win if you have the opportunity to meet them again. If you can keep this up, you will soon be full of confidence in yourself. Just for reference. That's how I learned. Why not ask me? I'm going to graduate from college.