I wouldn't have the right answer, but I would say something anyway. I would try to leave out the words "advanced", or "faster", or maybe even "harder". I would say this school is just to give the kids "more work". How many parents and kids really want more work? Not many. Well, some people do.
(I know. "Work smarter not harder," but describing the same darn more rigorus cirriculum as "harder", "more advanced", "faster-paced", or "more work" describes the same thing but evokes different emotions.)
And then you could say the principal gave you the choice: your kid could go to this advanced gifted school or you could violate UN child labor laws and sign a waiver allowing your six year old to sign a five year contract to be a teacher's aid. You thought it would be more like a childhood if they, you know, learnt stuff all day at school.
