It seems like you're having no problem with words at all, because you could pretty much copy and paste this, with some minor edits for audience:
this is not acceptable. DS9 has proven on their own pre-test that he knows the grade 4 curriculum, as he pre-tested in early Grade 5. AS this was a month ago, he's now completed another 1/2 grade of JH CTY at home. I'm confident he'd test mid or late grade 5 if retested today.
Not only does he not need to sit through a lesson on math he already knows, he needs acceleration to new topics. He also needs a much faster pace. When I serve up math at home, he gobbles it up and learns it quickly.
I've reviewed the grade 4 book completely (found a PDF of the teacher-instruction online). I am certain my child knows this material. Their pretest shows that he knows this material.
And then add a bit about what you'd like to see instead. Done.
It's clear, it's strong, it's well-supported, and it's not confrontational.
