I saw this when DD took the placement test for CTY. She was doing the second grade math fine but then hit some terms: convex and concave, that she didn't know. Then there was something else, she had not encountered. Not that she couldn't have answered easily given an explanation but I thought I shouldn't since it was a placement test. She had to start at the beginning of the accelerated grade 2 math as a result and she went through but it was useful as I worked with her to use a worksheet to figure things out, since she was doing it on the computer, and it helped build some skills. And there was clearly more in this section that she needed to learn in polygons and paths, which she had not learned before.
The thing is, with a program like CTY, they can go fast and learn as quickly as they want.
Ren
