IQ tests have been shown to have predict performance in a wide range of jobs. There is a 2004 paper "General Mental Ability in the World of Work: Occupational Attainment and Job Performance" http://wminsk-shared-docs.s3.amazonaws.com/Schmidt_Hunter_20... .
There's always someone pointing to some psychiatric study that it predicts some kind of future performance, despite the fact most of them can't be reproduced. https://www.npr.org/sections/health-shots/2018/08/27/6422183... Out of all the subjects out there, I find psychiatric studies to be the most bullshit out of all of them. It's whatever you want it to be. I am sure if I was motivated, I would find another study t…
IQ testing studies aren't the kind that fail to reproduce. The replication crisis is with other kinds of studies.