That is extremely high for an 8-year-old, but no - our school would not do it. I hope that your school is more flexible. If he likes AoPS, I would ask the school if they would allow him to continue with it (and if not, have him do AoPS outside of school anyway). This is the same position we are in right now with our 2 DYS, btw. Extremely high MAP scores, high IQ test scores, high out-of-level test results...but school is completely inflexible claiming the "Common Core" requires each stay in their age-for-grade math.
I hope that you have better luck than we are having. DD9 is about to start an AoPS course this summer, and DS6 is doing Beast Academy. All of this is, unfortunately, outside of school.
