It looks good to me.

I would add a little something there about why you would be concerned if the level of math being offered stays well below his level, long term. You've given them the upside of evaluating him further, and upgrading his math exposure if they find you're correct (kid would stay excited), so I'd also give them some downside... whatever that downside might likely be, given your son's personality. Would he be the kind of kid who might dumb down? Tune out? Act out? Since this is January, you've probably already seen how he's handling it.