Sorry Peachy I'll post in Chat next time, I do actually post here regularly regarding my DS2, who does have SN. I did actually think it was relevant here, obviously not.
Apologies.
We punish him with immediate time out, for four minutes. There is no point and it is unfair to punish him hours later.
We give him a smiley face if he is "good", for various things, and after 4 he gets a bigger reward.
We tell him everyday that if he has a a"good" day he can make cupcakes, and I remind him of this before I drop him off.
Also twice a day (after school and before school) we go through the "rules" - no hurting, etc, he can recite them all.
The school gives stickers if a child is "good" (and takes them away if a child is "bad" later), makes them have lunch on their own, and makes them miss out on playtime. The teachers have told DH that DS doesn't seem motivated by these things though (although he did get upset when his sticker was taken away last week).
It obviously isn't working, because he's been playing up now for almost two weeks, hence my request for strategies to help him.
I know this doesn't belong here, sorry, but I am completely at my wit's end.