According to the book, "The Millionaire" mind their is no relation to SAT scores and net worth or income. Although he did start the "900" club, for millionaires who got a 900 or less on the SAT's.
It was an interesting book, he found no real relation to grades in school, SAT, or anything like that, to there net worth levels. The only commen theme that could be found was that they were persistant and worked hard, however they may have only gotten a C or D average. They worked hard where it counted, they knew they couldn't beat kids like the one in the first post head to head in say Math so they didn't try.
The high income earners IE lawyers, VP's, etc. Placed more importance on school getting them to where they are.