<p>You know all those maxims about grades and scores not meaning much, and meaning nothing at all once you get accepted to a college? It turns out that GPAs actually do have predictive value that lasts beyond high school. A new study showed,</p>
<p>"a one-point increase in GPA doubles the probability of completing college — from 21 percent to 42 percent ... a one-point increase in high school GPA raises annual earnings in adulthood by around 12 percent for men and 14 percent for women."</p>
<p>What was measured, of course, was correlation, not causation. And a one-point difference in GPA is fairly huge. Still, it's interesting data.</p>