Seeking out the advice of professionals is a good approach, asking internet strangers you're going to get some questionable advice. You need to find out who th

Seeking out the advice of professionals is a good approach, asking internet strangers you're going to get some questionable advice. You need to find out who the strict teachers are that will not put up with that behavior and know how to gently correct it. Ask to meet with the teacher and/or administration at the school to come up with a behavior plan you can all agree to, they have counselors and social workers on staff that deal with this and have behavior plans they have used before. If their current teacher is very lax with behavior correction then asking to change teachers is a valid approach. Then follow that plan and expect the teacher to also follow that plan at school. Usually a plan will involve rewarding good behavior and punishing bad, pretty simple. Consistency is key. Ask the administration about what teachers are better at classroom management, those are the ones that will be able to help your child better than a fresh graduate 25yo most likely. Edit to add: punishment should not be severe but there might not be much leeway if your child is hitting other humans.