I vaguely remember that there was a virtual academy or other type of setup here letting kids sign up to do MAP that were homeschooling. I remember some threads about it late last spring. Hopefully someone with more details will pipe in.

Our situation is unique because DS is at a charter school. The district doesn't do them and wouldn't know what to do with the info. Just his school does it. They test all kids K-5 three times a year. They tend to focus heavily on the kids that score below 70th percentile and work to bring them up. Those scoring 90th and above are supposed to be receiving full differentiation to match their scores... which I have yet to see.