OK - I found your earlier posts. It looks like you're concerned because of the lack of differentiation this year, and you were thinking that he could skip up to second for the rest of the year? Maybe, after you thank her for the testing they want to do, you can ask to arrange a meeting in the next week or two to discuss ideas (including differentiation) for the rest of this year. The teacher might have missed that point too since you asked about it along with the grade skip. Sometimes just a bit more clarification is all that's needed, I think. it would probably help to have an in-person meeting to make sure you're on the same page.
Good luck - i hope i'm not way off on this; sorry i don't remember all the details.
