I'd expect the High WISC, Explore and MAP results would be a more accurate snap shot of your daughter's abilities than the 74%. Do you know if it's a national test like the Stanford Achievement Test or a locally developed test?
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My husband insists that had she been exposed to the math ahead of time instead of being tested cold, she likely would have done better. He also said we should offer to teach her at home or externally to get her up to their "advanced math" standards.
I'm inclined to agree with your DH.