"The problem with the School of Hard Knocks," they say, "is that the final exam comes first, and then the lesson comes after." I am a student of this school. No, don't ask for an ID card. No cards are necessary in this school. We enroll ourselves, and if we flunk, that's on us.
How do you flunk? You fail to learn the lesson. What about the exam, you ask? That doesn't matter. Almost everyone fails that at one point or another. It's the lesson after that counts.
And there are no grades, except what you give yourself.