My DS9 is one year grade skipped and in 5th grade now. He skipped 1st grade. Socially it was a great move for him. Academically it was not enough.We have no regrets about the grade skip.
Currently he attends a multi-age classroom charter school where he is actually working at a 7-8th grade level in all subjects while still with more age-appropriate social peers (who are also working ahead). I am not sure what the future holds but at this point we are going to try to keep a social/academic balance but we are open to more skips if needed.