Bcos scoring high on both requires raw brain processing power, which is related to ‘smarts’. SAT requires more reasoning; ACT requires more speed, but picks up its ver of reasoning in the so-called Science section…
Has either kid ever been tested for IQ? (If not, the anecdata is irrelevant.)
Umm, the library? (sorry, a bit snarky, but I’d guess that the world of cc and prep is much different than the ROW.)