1.) Can the school accommodate an acceleration of that many years? If he is in elementary, does the elementary school have kids doing Algebra? And once he finishes Algebra, then what?

2) Does he have gaps in knowledge? For instance DS8 also scored very high on MAP (like maybe a 9th grade equivalent), but he is very shaky on some lower level concepts because most of what he knows comes from Khan Academy and he's done very little actual practice. He also does very well with multiple choice tests and can guess well without knowing exactly how to do the computations.

3) Is there an actual pencil/paper pre-test the school can give him of lower level concepts to make sure he doesn't have large gaps?

4)Is his writing good enough for Algebra, and if not are any accommodations in place? Executive functioning ability to organize and remember assignments? DD was accelerated to 8th grade math when she was 8, and the teacher expected her to be able to take notes, show her work, and organize her notebook like a kid in middle school. She has ADHD so does poorly with that anyway, but it was a major problem.