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Take a well prepped average kid who has had three years of academic pre-school and place them with an MG kid with no prep, and it very well could be hard for a teacher of 30 to be able to know them well enough to sort it out until third grade.

I agree with this.

I also will say this, though: I think there is a lot of gray area, all over the place, and I don't place a vast amount of faith in scores, anyway.