Fundamentally speaking, a person who studies hard and is very effective at ordinary times should not have such a situation. So it is very important to work hard at ordinary times.
After all, we are not learning machines. In the process of learning, we will certainly have something we can't do. These regrets are actually inevitable, and everyone has them.
In the examination room, we should calm down, don't think too much, and concentrate on the questions we want to do. I always think it's stupid to tell myself how much to take in this exam and how many points to get before going to the examination room.
Targets are usually used. Once you enter the examination room, you have to put aside these so-called goals imposed on yourself. It's like a game. All you have to do is do what you can and do the right thing. This is a demonstration of your strength.
What determines whether you do well in the exam is what you can do, so you can think that what you have to do will always be what you can do. If you think so, there is nothing to worry about.