I remember something a principal pointed out to a group of us aspiring teachers, a long time ago--that the best students are not the smartest students, they are the ones that work the hardest.

This isn't exactly a revelation-but it is true--and it means that, even if there was a discernable genetic component to IQ, and even if IQ was truly reflective of intellectual capacity, IQ isn't a very good predictor of achievement.