Anne, type "EPGY" in the little search box up in the left corner... you'll see quite a few recent discussions on this subject.

CTY uses (resells) the EPGY program, so the two are identical through 6th grade. At that point, CTY splits off & uses (primarily?) Thinkwell from pre-algebra onward.


Being offended is a natural consequence of leaving the house. - Fran Lebowitz