I don't think there is a correlation at all. It's just that those are the times that stick out in a student's memory.
Just the nature of these types of exams. If you just every comment your professor makes and memorize the 40-page, 10-font outline that includes these notes, you can totally perform well and walk out knowing that you did so.
But we don't really do that.... we know the laws and elements and go in there with dreams and aspirations.