Here is a long, interesting article about the SAT. It is so long because it is a well presented argument, I believe. Thus it is hard for me to give you any sort of summary. I found it convincing, but then again, I find lots of things convincing. Your thoughts? I’ll leave you with an interesting aside paragraph in the article:
The cognitive stratification of American society—for that’s what we’re talking about—was not a problem 100 years ago. Many affluent people were smart in 1907, but there were not enough jobs in which high intellectual ability brought high incomes or status to affect more than a fraction of really smart people, and most of the really smart people were prevented from getting those jobs anyway by economic and social circumstances (consider that in 1907 roughly half the adults with high intelligence were housewives).