Thanks, Inky. That makes sense now.

FWIW, I probably won't bother trying to get ACCES to change DD's test to the 6+ version. It doesn't sound like there's a high enough ceiling even on the 6+ to make it worth testing again next year to measure growth. I'm thinking that the EXPLORE will work better for charting year-to-year progress. And if not, then there's always the SAT.