This was said to me by his preschool. He's 3 years old. I tentatively asked what he'd done and apparently it's not kicking, punching or rudeness. It's that he won't sit down or still for group story time.
So I asked how I work on getting him to sit still. They said I need to bribe him to do something sitting like colouring that he doesn't want to do then reward him. He doesn't really get the reward system. He has no motivation to get a sticker. I tried chocolate button for sitting on the toilet when potty training and despite a love of chocolate he wouldn't do it. He's very stubborn and it does take a long time to get him to do things he doesn't want to (brush teeth, put coat on)
I said to preschool he generally has quite a short attention span going from one thing to the next often and they said it's not that, it's behaviour.
They said it will be an issue at school if he doesn't learn now. I just thought he's a 3 year old active boy.