You're apparently alluding to "IQ" without saying it. But once you get above "low IQ" performance on these tests, their predictive value trends to zero. The correlation is very one sided (as explained by people like Nassim Taleb). Also, when I say "real world problem solving", that doesn't mean "income". A predictor can look powerful even if it's not measuring real-world skills, as long as institutions use it to distribute opportunities and labels that later show up as "job success".