Right, a standard would be for all the schools to agree to teach fractions beginning in 2nd, learn how to add/subtract them in 3rd, multiply/divide them in 3rd. I don't care what curriculum they use (although I prefer Singapore because there is minimal repetition).

A child that moves mid-year would have maybe a few months to catch up on gaps, not a whole year and some months. That's manageable for most kids.

I have not seen any standards set by NCLB, other than to say a school has to meet state standards or face losing local control.