> I find it very hard to believe an IQ test on a six year old is going to be much of a indicator of anything.
It is, though. To a disturbing extent. Individual IQ scores predict career success more than any other single metric.
It is, though. To a disturbing extent. Individual IQ scores predict career success more than any other single metric.
So while adult/college IQ scores have been correlated with success (equivalents are used university admissions after all). I am not aware of any studies/data sets that show a strong correlation of IQ as measured in six year olds and adult success. Also any study tracking IQ over time is going to have significant problems with goodhart's law.
[0]: https://www.psychologytoday.com/us/blog/memory-medic/201805/...