This is a good article that touches on the predictive power of IQ for life outcomes such as employment: http://ftp.iza.org/dp10356.pdf
Though I am skeptical of their conclusion that, since "adding grades and test scores to models with IQ and personality produces greater predictive power for the outcomes studied", there is evidence that grades and test scores "capture relevant dimensions of human capability not captured by IQ and personality." There are a lot of social aspects involved on how grades and test results can influence those outcomes.
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