Higher IQ

[Jackalope]

I sincerely doubt that the correlation is very strong.

BTW, by excluding those other factors - which are significant - you essentially make any statement bout correlation meaningless.

IIRC it's generally a good indicator when it comes to education, lifestyle choices, longevity etc. If let's say two siblings have a very similiar upbringing, life, receive the same education etc but one scored higher on an IQ test it's more likely the one with higher IQ turns out to be successful i.e fares better academically, makes better lifestyle choices, lives longer. But, of course, it's definitely not causation. Although IIRC grit, motivation, self-control is even better.

Well. I would agree that it's a fair predictor of academic success, the rest, meh. "Successfulis" such a subjective term so as to be useful. Within those constraints sure, but I wouldn't agree that's how success is measured.