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<p>I think that’s basically right. But I’d go a step farther. The SAT and ACT are testing for different things. The ACT has always been been more oriented toward measuring academic “achievement,” i.e., how much do you know? The SAT has always been more oriented toward measuring academic “aptitude,” i.e., what is your native capacity to solve non-obvious problems and discern subtle distinctions? Consequently, the “brilliant slacker” will often do better on the SAT than on the ACT, while the “diligent grinder” will often do better on the ACT than on the SAT. Some do well on both, some do well on neither. I think the best predictor of academic success would probably be SAT + ACT + HS GPA/class rank.</p>