I have to say that I vote to answer fully. We had similar questions when DS8 was in K and they ended up (after a general assessment of all the kids) doing some pull outs for him, sending him to the computer room to do Imagination Island, KidBiz 3000, Mathwhizz and allowing him to check out books from the "big kid" side of the school library that were more his speed and interest level.
I hope your school is willing to be flexible... that was the key that is saving us from going crazy!
Good Luck DeHe!