[grdgyredb]

You are right it’s not trivial, but on the other hand if you simply try to make such a test you’d do better than completely uncorrelated pretty easily I’d suppose.

[sokoloff]

SAT has has been around almost 100 years and ACT around 2/3 of that, so they've had pretty long to hone the tests as well. This is far from their first stab at it.

[grdgyredb]

And indeed they seem to have produced a test that is correlated with success.

[sokoloff]

Absolutely! Some people seem to find that correlation to be inconvenient and/or threatening.