This could get controversial, and (edit: most) everyone will say they're above average or better.
Myself? As a child I tested in the genius range (whether that's still true today or not, I don't know, but I am incredibly lazy so I would say "technically yes, but really no because I don't challenge myself") and was put into advanced classes until funding ran out and I went back to normal class.
... Anyway, I went to university and college and am a librarian for a legislative library now. Before that (and it was my first job after graduating) I was hired at a prestigious private school, so I must have done something right.
Still not sure what it was, though, because I'm as lazy as they get.
Honestly, I never learned how to study until college. All through middle school, high school and university my grades were only average because I never sat down to study anything. I did my homework, but never spent any time prepping for tests or essays and such. I'm mad at myself for that because I could have done so much better when I was younger, but because I did well without trying, I never actually learned how to try. Until I went to library school and got serious, then I would sit and study for hours on end and got 4.0's. I was more proud of myself for studying than the grades.
So, yeah. I chose 'genius' because I technically was, but I never learned how to try or had to work hard, so I failed myself in many ways and didn't smarten up until my mid 20's. And I still have to really work hard to motivate myself. ... As I reply to this thread instead of tackling the "to-do" list I made myself here at work so I can check things off my list and feel like I've actually done something.