At this age, i would err on the side of safety, because it would be not fun next year if the one child gets counseled out and the other is doing well at the other school. After even one more year, you can re-apply to 1st grades elsewhere if you think your child with ADD has done well enough at McLean that you feel comfortable DC would succeed elsewhere. Otherwise, I'd even give it another couple of years. Someone once said to me that up until third grade is about how to learn, and then after that is about learning subjects. I think this is true, and I think a safer choice in the early years can educate you when your DC with ADD is ready to move on - if he is. If at McLean you see the typically developing child just needs more of something, you can always switch that DC out first. We have had a DC with some minor issues and I have found the better safe than sorry approach to have worked and be least stressful for us, even though it has felt many years that ok, half a year here has been enough, now ready to move on. A much better place to be than, ok, a half year here, how will we ever get through another half year, and apply out at the same time, and what do we do with the other child. Too messy.