We had our son tested to see if he should go to kinder at 4, and the tester said that she would have him go to kinder with agemates to learn all the social/do school stuff, and then skip 1st. It all worked out well for us, though there were lots of meetings before the school agreed to a grade skip. There is a lot more play stuff in kinder, so nonacademic stuff to keep your kiddo less bored. First, at least in our state, is still a learn to read/learn to do very basic math year, with much less play than kinder, which my kiddo would have hated. Just throwing that out as a possibility.
