I don't know anything about the teachers, but after I wrote this DS informed me that his teacher this year is moving to 4th grade! I hesitate to meet with the head in person because I just did see her, following his ERB test. We discussed his results and I touched upon the conflicts with his teacher then.
After DS told me his teacher would be teaching 4th grade next year I just wanted to remind the head that he did not have a great experience with her, so they would not place him with her again.
Thank you so much for the bump and the advice.
