I don't think grade acceleration really matters for DYS as long as you have the scores that are required.
Yes, but the trick is how the scores are reported (and maybe normed). For example, the qualifying scores on the Explore are grade-based, not age-based, so you could be at a disadvantage if you had a kid that had skipped a grade. That said, if we had scores that would qualify on an age basis but not a grade basis (say, an 8-year-old 5th grader with a composite score of 17), I would submit them anyway, with an explanation that while my child was actually enrolled in 5th grade, s/he would have been a 3rd grader if not skipped and so the score should be considered to be qualifying.
ETA: alliesebas, my DYS9 had qualifying IQ and achievement scores, and we just submitted them without any portfolio items. They were accepted with no problems. I wouldn't bother.
