>>GWB got a SAT mark that implies a IQ over 130.
Huh? He scored 566 on verbal and 640 on math for a total of 1206 points -- around 140 points below his Yale classmates. I'm not sure how this implies an IQ of over 130, unless you believe that Yale is attended by pure geniuses (hint: it isn't).
Furthermore, both SAT and IQ scores are highly correlated with the quality of education one receives. They don't measure innate intelligence.
But if we still care about IQ, then a 2006 study of presidential IQs estimated Bush's IQ to be around 125, the lowest in any president over the past 50 years, and higher than only three other presidents (Grant, Monroe and Harding). You can read about it if you want [1].