we did cty math several years ago for a replacement curriculum for the classroom in elementary school.
It was excellent for that. and the "teacher" online was useful at times. it was better than just the EPGY because we got a grade that the school accepted. two years were done in one year and the acceleration was kept after she got into an accelerated gifted school. the statistics in that program is far ahead of anything shes done since. It would be a burden to do in addition to a regular school curriculum.
There was a writing one that we did over one summer that was also excellent. the online person was more a guide than a teacher. the other kids in the class were from all over the world and they had lots of wonderful literary criticism for one another. this gave her a big boost in her creative and descriptive writing and helped quite a bit with writing mechanics and learning the underlying reasons for the mechanics rules to exist in the first place. again not a thing to add on for a busy kid. But a great one one for a kid that loves writing and wants to learn some stucture for it and get broad feed back on their work.
