[pas]

Things progressed a bit since then, and [IQ, but let's say SAT] test scores correlate very well with a lot of things. Even after controlling for as much socioeconomic and other confounding factors as you can. (Sure, that's still not a conclusive experiment.)

[mowenz]

We agree they do correlate, but there is actually some debate about just how well intelligence tests do correlate with success, but the general idea of them remains the same as described above afaik, unless you'd like to point what has changed?

Many things correlate with successful life outcomes. Height for instance correlates with income.