My daugther is also doing the same thing as they are recommending for your son. She is in K but goes to 1st for reading and math everyday. It seems to be working out okay but I do notice that she is missing some things while she is switching back and forth when she speaks to me about her day. For one thing the K teacher is not assigning her any "jobs" and she really enjoys things like that to play a leadership role in. We had parent teacher conferences yesterday and they want to keep doing it that way. We approached the option of whole grade skip but the principal was not to keen on it. My question is what do we do with her after this year and the year after that and so on. The answer from the K and 1st grade teacher was will will approach that when the time comes. I don't want her to be a flip flop her whole elementary years!