How do I get my 5 year old to behave at school?

he nay be over bright and bored at school maybe the work isn't stimulating him enough so he acts the clown then again he may have an illness like adhd i would get him checked out do the teachers at school complain about his work is he doing well in cl having said that he is only five and he doesn't realise yet that education is important try maybe saying to him if you are good in school today we can go on a special trip this week end and then if he behaves badly the next day the threat of the trip being cancelled may inspire him to behave at school get him eye q you can get it in liquid form or chewy tablets and see what that does it may help failing that talk to your Doctor and see if he can help