I'll commiserate! But I don't have any solutions.

My son went to a private 6-12 school for the last two years where he skipped from 4th to 6th the first year and then from 6th the 8th the second year. He was in Algebra I the first year and geometry the second year (so two whole grades with an additional grade for math).

There were two main issues with the skip(s). The first was that, except for math (where he was properly placed), the two skips weren't enough from a cognitive standpoint. But from an executive function standpoint, they bordered on too much.

So we are back to homeschooling this year.