Five going on fifteen?

Mstr A is pushing the bounderies. He's pushing them very hard:-( In fact his behaviour is starting to strongly resemble teenage rebellion.

His teacher came to speak to me today when I collected him from school. He had not done any of the work he'd been asked to and had been "quite cheeky" to her - in a way that she had never seen from him before.

so he was in disgrace as soon as he got home, and it degenerated from there. When I asked him how he had behaved at school, he told me he had been good & done all of his work. I told him I would not accept him lying to me & asked again. he tried to lie again, then on threat of his gameboy being binned, admitted that he had been naughty. We sent him to his room for 30 mins, which is our usual punishment for lying.

When he came down, he apologised for lying, and all was quiet for 5 mins, until Aggie asked him to clear the table & tidy up for supper (this is one of his daily chores) he refused, saying he didn't want to. After a bit of argy-bargy, Aggie sent him back to his room.

i left it 10 mins, but then went up to bring him down for supper, as he really does need to eat if we want any hope of reasonable behaviour out of him. He was allowed down on the condition that he tidied up the moment he finished eating. so as soon as he finished, i asked him to tidy up. He picked up two pieces of paper, then LMB picked one up (she has to help tidy), and he threw a screaming hissy fit that he hadn't picked up that piece, chucked everything back on the floor & just lay down screaming & kicking.

So once again I sent him to his room, but this time I told him he was to go to bed. I went up 15 mins later to find him hiding under his bed! Pulled him out, took his clothes off (admist great protests) & gave him his pyjama's, and told him to go to bed. Then I went back downstairs.

next I hear a great thumping and bumping, and go up to find all of his toys, furniture, bedclothes etc thrown around the room/down the stairs. He has been warned about throwing things around before, so i took a black bin bag up & started throwing all of his toys into them. I took a whole bag full away & told him to tidy up the rest if he wants to keep it.

That's where we are now.

His tantrums have definitely been getting worse recently. i don't know what is causing it:-( I know that he is probably tired today, but that's no excuse for his behaviour today. I have o admit, there was some shouting involved on my part. it's hard not to. Time out in his room used to work well, but it's no good if he is going to break everything in the room - and probably himself soon, either deliberately or accidently. Anyone got any helpful idea's on what to do next?