Just had a call from my mum to say that DS has ripped up a letter sent home by the school before anyone could read it. When i asked him why he's done this his reply was so he didn't get into trouble - he did however leave the envelope and shredded paper in his school bag 
When i asked him what the letter was about he said that he had been taken out of class for calling another little boy names but couldn't remember what else he said.
This is just on in a long line of incidents that DS seems to be getting into at the moment (the first at school granted). He seems to be so cheeky just now and so stroppy.
I need help - where do I go from here - what can I do to put an end to this horrible attitude? 