Am I missing something? (Score 1)

When I was working on my BS degree, I took a core graduate course without several of the pre-requesites. When it came to the first exam, it was easy and I finished in about 30 minutes. I was a bit nervous though because everyone else was working away and no-one had turned their exam in. Well, I spent another 10-15 minutes going back over my answers, wondering if I had missed a page or something. Finally, I turned it in and left the classroom. I hung around and saw people trickling out in another half hour...

Turns out I really did have a better handle on the material than anyone else. I got the high score...