"Or talk about rates of progress, such as a gifted student could progress through regular material at a rate of 1.5 years per year of school, a highly gifted (above 145) one may progress 2 years each year, and a profoundly gifted student (above 160) could progress 3 or 4 years per year... given the opportunity."

Zen Scanner - where did you find this info? This is something concrete that I think our principal could really understand.