[perpetualpatzer]

They can be, and that's a statement about the distribution and consistency of skill in those activities. I see little reason to believe those distributions apply to SAT taking or general capacity to learn (which is what you're really aspiring to measure).

If we set up an ELO league for best-of-three rock paper scissors, I'd expect score to diverge over sufficiently many hours, but would give almost even odds to a 99th v 93rd percentile candidate.