TA: A Term Definition

The basic argument is that limiting students to only have the options available in public high schools is blocking them from reaching their potential. In my original enthymeme, I used the phrase "keeping gifted students in high school", but that wasn't really what I meant to say. I need to define my A term very specifically. I'm not trying to argue that parents should pull their kids out of school. I'm trying to argue that AP courses aren't always enough of a challenge for every student, and that parents are foolish to believe that the government will change anything or that their children will be accommodated in any way. I am writing to parents who are content with letting someone else manage their child's education. I suppose that my A term could be something like "Using only the resources found in public education" or "not using other sources of mental stimulation outside of public schools" or something like that.
Also, I need to make sure that the term "gifted student" applies to a more specific group. Anyone who is willing to work hard can take AP classes in high school, and do well in them. But I'm referring to the kids who get bored in AP Chemistry and AP Statistics and AP Government because it is way below their level. I'm not talking about students who always get straight As in hard classes, but about the students who could be teaching the hardest class in the school. So "keeping gifted children in public schools" should really be "limiting really really really gifted children to public school programs (and nothing but public school programs) severely slows their progress". I just need to make those distinctions clear in my paper.