This is a good point to bring up, but this correlation is still being debated: the causal connection between the IQ test and the correlation is unclear, and there is debate on whether the correlation is being constructed through bad data or analysis techniques. Because of this, no one can confidently claim whether IQ tests predicts good job performance, employment, etc.
https://pmc.ncbi.nlm.nih.gov/articles/PMC4557354/
[Skip to the conclusion at the end to get the tldr, since this is a long scientific publication]