It seems too early to tell about switching the younger ones. Some private schools are terrific for middle school and 'same old same old' for elementary school, so I'd watch out for that.
I don't know much about EM itself, but if placement by exam was allowed, would your younger DCs be able to be subject accelerated through much of EM? If this is the case, I would perhaps hothouse enough so that they would really be at a good level.
But seriously, give dd6th grade at least a semester at the new school before you decide that the current elementary school is worse, unless one of your DC are suffering. KWIM?
Love and More Love,
Grinity
