So, let’s assume the child in question lives in a household without trauma, is not neurodivergent, and is otherwise emotionally stable. In that case what works

So, let’s assume the child in question lives in a household without trauma, is not neurodivergent, and is otherwise emotionally stable. In that case what works best is reinforcement. Reward good behavior with praise and treats while punishing bad behavior both emotionally and with reprisals. It’s the same as training a dog and it works well with children, especially when there are multiple iterations and parental consistency. For children with trauma this might require extended learning time. For children with autism there is not a straightforward or predictable answer. As a parent you must accept the reality that when your child starts school they are entering a world beyond your control under rules and influences that are not your own. If, as a parent, you cannot stomach that loss of control, you might have to consider home schooling. This is something every parent goes through.