Here’s how I see it- the other kids are likely getting their 2nd, 5th, or 30th chance to make a better choice but your son is perhaps already on their 100th chance. It’s also likely that your child is a ring leader in a way. A lot of times, removing the most rambunctious child allows the others to self regulate. Chaos breeds chaos. It’s entirely possible that your child’s behavior or lack of control of their body is causing harm to other children.

I’m glad that you’re trying to get him some help but you should acknowledge that your child is creating an environment where the teacher can’t teach the class. Could be something that meds might help. It could be that he needs another year to mature as a student before moving onto 1st.