It can be difficult to prove advanced math ability unless you've been actively teaching, in any case. Unlike reading, children generally need concepts introduced if they are going to do well on assessments ahead of grade level. (When I saw my DD's assessments for a grade ahead, she bombed out on things like pints and gallons and "lines of symmetry," which was hardly surprising since we hadn't taught her that stuff.) I agree that EM is especially weird and in its own odd world.
To the OP: my suggestion would be to try to locate other parents with advanced or gifted kids and find out what, if any, accommodations their kids are getting. Or, do you know any teachers in the system personally? Sometimes you have to know what to ask for.
