@1ofeach , I would also add that you will need to have a conversation with your child and make it clear that it is up to him to excel and “knock it out of the park” even if he is bored. Schools do not like to set kids up for failure, so he’s going to have to prove that won’t be the case.
While I know you had hoped for a great math lesson (which he still may get), the immediate lesson at hand is that there will be teachers and classes we don’t like, but we only punish ourselves by not taking full advantage of them because we don’t like them. I would make sure he understands how he was placed in his current class, what was done to try to move him, and emphasize that now, if there’s a move to be made, it’s on him to demonstrate that he’s up to it. My kid, at this age, was one who tended to "revert to the average " rather than make himself the outlier, so I understand the challenge you face. But at some point, what you tell him will probably resonate. Again, I feel for you and am rooting for you both.