Imagine how much power public school teachers would hold over students if college entrance were determined only by high school GPA. And, imagine how much “social engineering” liberal teachers could do with that power.
Which is why Murray recommends keeping the subject specific achievement tests which are now required in addition to the SAT. Basically he’s saying we now rely on three measures (GPA, SAT and achievement tests [e.g. SAT II tests for physics, chemistry, etc.]), and you can get to the same result by using only GPA and achievement tests.
good point, kind of amazing he missed it, but he does advocate 4 mandatory college board achievement tests as the standard. The educational establishment may actually have more to fear from that, since it would seem to correlate more directly to teaching inthe classroom than to innate ability.