To contradict myself It may well be legit—the achievement bit is what we now call the subject tests and given this was pre-recentered scores the range isn't that far off. And SAT scores did adjust to every 10 points, but that may well have been before that adjustment.

It's probably the Stanford Achievement Test, not the Scholastic Aptitude Test (now SAT) used for college admissions.  If it were the SAT entrance exam with a 425, I believe the percentiles would be even lower. However a 38 and 39 percentile with 31 and 36 amongst college bound isn't very comforting. Also check out her self-reported grades. LOL. I doubt Wasilla was terribly rigorous. All that said, comparing Bush and Bradley scores to modern day scores would be rather unfair. That far back there was a significant cultural bias in SAT scores with east coast upbringing. So a kid from a small town in Missouri would be inherently disadvantaged. Bush is an odder case with a fairly smart father who still mangled language in hysterical ways may well account for the same phenomenon. And, of course, the SAT today is taken by a far broader audience.