Brigham eventually recanted some of his racist beliefs, but it seems this did not result in any modification to the SAT [to be looked into further].
In 1923 Brigham published his landmark book, A Study of American Intelligence, in which he warned white society of the dangers of rising racial and ethnic diversity. Brigham’s book was used to justify everything from anti-immigration legislation to forced sterilization of people deemed “unfit” to procreate: “The decline of American intelligence will be more rapid than the decline of the intelligence of European national groups, owing to the presence here of the negro. These are the plain, if somewhat ugly, facts that our study shows. The deterioration of American intelligence is not inevitable, however, if public action can be aroused to prevent it.” 12 The book was highly influential in American society and academia, and shortly after, Brigham was asked by the College Board to help develop a new test to screen college applicants for academic ability: the Scholastic Aptitude Test, or SAT. 13 […] But by 1930, Brigham had rejected his own eugenics-based tests. He’d found some fundamental flaws in his methodology. In particular, he had come to realize that what his tests showed, instead of intelligence, was the test-taker’s ability to speak English, attend good primary schools, and demonstrate a strong familiarity with white culture. He wrote a refutation of his earlier army research in a paper titled “Intelligence Tests of Immigrant Groups” and later denounced the SAT tests that he had based on that research, but by then it was too late. 14 The SAT persists as the primary test of student readiness used by colleges and universities throughout the United States. 15 — Mediocre, pg 93