I don't know the answer there, but I have the same issue with my DD's reading. (They have to read 5 AR books at one grade level before they move to the next, and DD didn't realize that any out-of-level book reset the clock, plus the AR software has been down for the last 2 weeks so she's been reading but the books haven't counted, plus they're limited in how many tests they can take in any period. I've been really wanting to say "She's aced the tests on the next-level books she accidentally got - just let her move to that level," but have so far managed to keep my mouth shut.)
So if my kid were your kid, I'd probably wait. My 7yo is a slow writer, and it takes her 5 1/2 minutes just to write the number of digits in the answers to 100 addition problems, and 8-9 minutes to solve and write. If it were her in that same situation, I'd be lobbying for the teachers to agree that math acceleration did not mean "do both 2nd grade and 3rd grade math." Fortunately for us, her teacher uses a 10-minute standard, and volunteered that she didn't think DD would ever be able to meet the 5-minute standard due to writing speed.
