Those numbers doesn't add up, USA average was 478, how could whites that are a majority score all the way up at 531? There aren't enough black people to drag 531 down to 478, and only black people are below average here.
Edit: Yes, look at page 34 in that report, it says that white kids scored 25 higher than average, so 503. Where did you get those numbers from, those are wrong.
Edit: Yes, look at page 34 in that report, it says that white kids scored 25 higher than average, so 503. Where did you get those numbers from, those are wrong.