Clever fools: Why a high IQ doesn't mean you're smart
newscientist.com
newscientist.com
It's as simple as that.
Being intelligent can also make transforming information to knowledge easier. If you have high IQ and still are stupid that must mean that you don't pay much attention to the domain that you are stupid about.
Is there any evidence that his score is really 120?
"I recently converted Bush's SAT score to an IQ using the high school norms available for his age cohort. Educational Testing Service happened to have done a study of representative high school students within a year or so of when he took the test. I derived an IQ of 125, which is the 95th percentile."