From your link:
"In addition, a great many students within the other four categories (multiple disabilities, mental retardation, traumatic brain injury, and developmental delay) are also able to function at grade level on the tests with or without approved modifications or accommodations."
I think that is bunk. If students with mental retardation are able to function at grade level, that's a strong sign "grade level" is not being defined in a way relevant to average IQ students, much less gifted ones.
