DS is ready for 2nd grade math and reading but has a lot of social and emotional work to do before he's ready even for 1st grade. The more we think about it though the more it seems like maybe he has a mild SPD issue or something. If so it would certainly explain a lot and maybe help the school to understand better what is going on with him.
All we get for differentiation right now is harder worksheets he can do in math and phonics groups. She gives him 1st grade comprehension pages to do when the rest of his group does the prereading stuff and works on the sight words. And she has a packet of math worksheets he can do at various times if he chooses to.