How's your relationship with the teacher? Will she "get it," or will such help from home on math assignments seem to her to be an imposition (or a no-confidence vote on her, or whatever other negative thing...)? To me, it seems perfectly smart and helpful for you to send in appropriate work so she doesn't have to find it, but then I'm not the teacher in the room with your child, so what I think doesn't matter one whit.

I'm going to read the comments on the SB L-M with interest, though I have no help for you there, beyond that I would think your previous tester might be able to steer you in the right direction. It's at least a logical starting point. I've often wondered if the L-M might be useful in our case, but I've never been sure enough to seek it out. It's what I was tested on when I was a kid, so seeing how DS6 did on it might give me a better feel for where he's really functioning, comparatively speaking, particularly since he and I seem wired somewhat similarly.
Babbling now...Anyway, I'm glad you asked!
I've been thinking about you as the Davidson notification date draws nearer for you. Fingers crossed! Not for nuthin', but your son sounds like a shoo-in to me. I hope I'm right.
