Son is in yr6, quite bright but generally untidy, disorganised and distracted.
Is this normal and to what extent should I be involved/leaving him to it?
Example: this morning he couldn't find his homework folder. Bits of homework on dining room table and desk in bedroom. There was evidently one piece he hadn't done despite me asking him during the week had he done his homework? Should I be checking he's done his homework? I think in yr6 he should be able to organise a folder and a few sheets of paper 
I've said to him when he goes to secondary he's going to have a lot more to manage so needs to be used to doing so.
He's sitting all level 6s as teacher thinks he us capable but has warned things like rushing through the paper and not reading properly or confusing his workings out in maths through untidiness will hinder him. Personally, I'm not that bothered about SATs but I think seeing how this approach can/ will affect him may be a good lesson for him.
Is this what all yr6 boys are like? Should I be doing more? Less?