Question asked, what should I do if I am not in the state before the exam? This requires an analysis of the specific manifestations of the so-called "absence". From my personal experience, there are roughly three situations:
1, I have no idea about my preparation. Often manifested as: the brain feels full for a while and empty for a while. I feel deja vu when I pick up the information, and I feel that I am not completely sure about the problems I may get.
2, suffering from loss, want to win and afraid of losing. The concrete manifestations are: suddenly expecting life to change from now on, suddenly worrying about the bleak future of failure, and swinging back and forth between heaven and hell.