I have nightmares about the college entrance exam about once every two weeks. Basically, I dream that I drop out of university and retake the exam, only to find I can't answer any of the questions. For the three months leading up to the exam, I was guessing on all the math problems. Then, I dream that I've already graduated before waking up. I never think about this during the day. The college entrance exam is truly the biggest psychological trauma of my youth.