There is a lot of correlation in results between different IQ tests, SATs, or any other standardized test or intelligence test. Someone who scores well on one tends to score high on others - whatever it is that is being measured.
There is enough correlation between such results that one can make broad general predictions. Someone with an SAT score of 1000 would probably perform poorly as a Harvard student. In aggregate, that is true. I don't believe there is enough differentiation (or maybe there is less) to predict that someone with an SAT of 1400 would outperform someone with a 1300. The same probably works for IQ test results with a weaker predictive ability.
All these written aptitude/math/english tests correlate with other such tests but maybe not a predictor of business acumen at all. The writers of the controversial "Bell Curve" showed that there is correspondance between income and IQ in general. This may be true in an average sense. People in the top IQ quintile average more income than those in the bottom quintile. It doesn't say anything though about whether Joe Blow with an IQ of 148 will make more than Joe Mama with an IQ of 108.
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