I have a similar child in my Upper Foundation class. I manage him with a mixture of positive stategies (individual timetable, stickers and diversion) and time out. This has recently begun to work - but it has taken 8 months to get there! A lot of his behaviour was a result of desiring negative attention at home. When we take him to time out, he has to sit on a cushion for a minute without screaming or throwing anything. Our time out place is in an enclosed corridor with a low window, so we can see him without him being abe to talk to us. I know it sounds awful, but after months of training him that noone is going to talk to him, we just lead him to the cushion, he sits there for a minute and calms down. He also has no understanding of hurting others, but can now stay calm enough talk about what is making him angry. i can give you more details if it seems helpful in anyway.