The act of grading itself is what's wrong with colleges. Different people learn at different paces. Forcing everyone to work at the fastest rate and then judging them for not performing is what kills interest in subjects. People should be allowed to write tests when they want to, learn at the pace they want to decide for themselves when it's time to move on, because lets face it, not everyone cares about some prof's pet subject.

The problem is that higher education became something marketable and universities decided to sell diplomas instead of giving people a chance to learn skills they think might help them reach their goals.