“But SAT/ACT line up with income more than just about anything…”
We keep hearing this over and over. But of course correlation is not causation.
It’s changing, as many people have noted because the SAT in particular has become increasingly focused on “achievement” rather than aptitude, but the single biggest factor in explaining scores is intelligence. There is a weak correlation with income, much higher with parental education.
For everyone who thinks it’s income, take a look at places like Stuyvesant High School (where approximately 20-25% are national merit semifinalists) and where upwards of 40% of the kids are eligible for free lunch. Or look at Davidson Academy, where 70% of the kids are national merit. Both those schools screen for high intelligence - Davidson seeks to admit only 145 IQ and higher.
I know a number of kids who recently scored 1500+ on the SAT and who were under 13, including at least one who was under 12. No tutoring so far as I know and for a few of them I know with certainty, obviously no curriculum preparation - they were all in public middle schools. There are dozens of such kids every year, usually discovered through the SET program.
Once you control for race, income becomes almost irrelevant as an explanatory variable for scores.
Parental education, again once you control for race, is significant. But this is to be expected. Until recently (perhaps), higher education implied higher intelligence, and so the kids of higher intelligence parents have higher genotype intelligence. Hence the correlation between scoring and parental education. It’s not the home environment that is provided, or the schools, it’s the genes these parents provide that make the difference.
The truth is that environment has little to do with intelligence - at least the researchers have not figured out what environmental factors increase intelligence. Reading to kids, having books around the house, intense schooling, etc. seem to have no effect on intelligence once kids are into adolescence.
I can’t embed the link, but if people are truly interested in reading, google the “random critical analysis” blog, specifically the post on “no, the SAT is not measuring income,” and read through all the linked sources, and then read their sources, and come to your own conclusions. Then let’s have an informed discussion.