FWIW, what helped us make a case for math acceleration for our ds was to have him take the course assessments at ALEKS. The results on those assessments can be easily and directly correlated (within ALEKS) back to each state's set of curriculum standards so it was easy to produce a list showing ds had mastered concepts a-x needed for credit in course z.
I'm sure you can do that with other online (or other) math courses too, I only mentioned ALEKS because it's the option we used.
polarbear
ps - fwiw, I think I skipped pre-algebra when I was in school (can't say for sure because it was so long ago I can't remember what the courses were officially called; I was accelerated in math and I think pre-algebra is around the time it happened). Now our school district has two pre-pre-algebra courses as well as pre-algebra leading into algebra, plus they've re-sorted the way math in high school is presented. If I was asking the "is it ok for my child to skip ___" question I'd look at the curriculum taught my specific school district taught rather than make assumptions based on the course name for any math that's taught before Algebra to get an idea of what concepts my child had been introduced to.
polarbear
