They state that they WANT them to be testing between 70-80% that it indicates that they are challenged...BUT my DS freaks out if he scores low. Do they take the different personalities of gifted youth? I do have the choice to leave him at the current grade level, right?
My dd9 has been using EPGY math for most of the last year as a supplement. She is a bit above grade level on it but not a lot. However, we aren't using it a lot (maybe an hour/week when she was really doing it more and an hour/month total over the summer).
She gets 100% correct on most of her sessions and overall has stayed pretty consistently at around 98% correct. We did bump her up right at the beginning b/c it started her 1/2 a grade below her current grade and she already knew that material. She was getting most or all of them right and she wasn't learning much.
Once she was moved up to right to her current grade level, she continued to get most or all correct but there were new concepts so it no longer seemed too easy. During the school year she moved through a little faster than one month of EPGY in one month of time, so, like I said, she's maybe 1/2 a year ahead of her current grade level in placement right now and that continues to seem appropriate.
I don't think that the child needs to be missing 20% of the questions to indicate that s/he is learning something new. If s/he is getting 95% correct and there is new information, that is still probably great and better for the child's confidence especially if he gets upset when he misses too many.