Really, in a classroom of 25+ kids, 1 teacher, and no aide (typical class size in our district - and I'm assuming most districts), I'm thinking best case scenario for differentiation is the kid will be pulled aside to do work autonomously with no guidance from even a well-meaning teacher. DS6's K teacher balked at giving him anything different from the rest of the class. DS would have loved to escape the tedium and go to a corner and read, do worksheets, etc. on his own. I think in-class differentiation would probably work best with "acceleration" vs. "enrichment" simply because progress is more easily measured. Maybe you could think of some concrete differentiated activities your DS would benefit from and ask the school/district if he could be provided with those. For example, could he be pulled out for self-paced computer learning? Could he have time set aside to do math worksheets that increase in difficulty (i.e., accelerate) as he gets a certain percentage correct?