There IS only one Explore test, and it's designed for 8th graders. I guess it's sort of a misnomer for DA to say "6th grade Explore," but I think this is a holdover from when there used to be different qualification levels depending on what grade the child was in at the time. Since DA now has only one acceptable set of scores using the Explore test, it doesn't really mean anything (other, I suppose, than the fact that 7th or 8th graders could NOT qualify using Explore).