There are good points on both sides.
His: Its NOT real school. Its a voluntary extra. This is his last year to have her not in real school. I'm with him 100% on this. If you want her enrolled during your time, great, but not during his time.
Yours: 100% with you that 3 hours away is impossible for 50/50 or 33/66 ONCE she's in real school, there is simply no way for that to work. He cannot drive her 6 hours a day to/from school, and driving 6 hours at night to pick up is an out of line burden (schedules + cost of gas). Since he is the one who elected to move away, the onus of transportation should be on him.
In court: You never know how things will go. I have no idea how they will find. They could find in his favor, or yours, or a combo. They could find that schedule a until kindergarten, them schedule b at start of school, or they could want to keep you out of court again next year and want schedule B to start now. THE ONLY thing I know from court, is far we've never left "happy". He's never gotten what he wants, and Ive never gotten what I want. Heck. The courts may do that on purpose to for e parents to come to agreement outside of court.
HOWEVER, I'd be very leery if your agreement is 33/66 & you're refusing to return her without agreement in writing. If so, he could call the pice on you at any time for custodial interference. In that case, expect to lose. Badly.
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Per your SWH
UM... "What every other dad gets" is NOT every other weekend. USED to be. The trend at this point is 50/50. Not 80/20. Since he moved away he MAY have screwed himself there AFTER school starts (or you may find yourself with her 20% of the time if she's in school in his town). But be very careful with these assumptions.
In most places, and most situations, all one parent has to do is ask for 50/50 & they get it.
But if you've been keeping her during his time NOT by agreement, he may get 100%.