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Was it the foundation paper? If so, it will only cover the basic skills that he has probably been taught already. I would get him to do the second paper as his overall mark will be more of an indication of level.
Does he say Maths lessons are boring at school? Sometimes if a child just gets on with their work a teacher doesn't realise that the work is too easy for them. I'd be inclined to mention it to his teacher, in case there are any extension activities they can access for him i.e. Maths Challenge at a local Secondary. Also, if the school is doing the Level 6 SATs next year he could be entered for those.
Nothing wrong with letting him access Maths games or tests at home as a 'treat', as long as his Literacy is the focus of homework.
I had my DS try the KS3 maths SATs for 2009. He is 10 yrs 5 months. Obviously he hasn't studied much of the material yet, as still in Y6, and hasn't done any extra maths study at home (not as far as I know at any rate!).
He hasn't done Paper 2 yet, but with the mental maths and Paper 1 he has scored sufficient for Level 7, so he's working at Level 7 or 8.
He seemed to enjoy the tests a lot, and said the mental maths was much too slow/easy.
Should I encourage him in his maths ability? Or just leave it to the school?
I have been working with him on English, which he struggles at a fair bit (upper level 4), and generally say he can't do maths, because he needs to work at English, but he enjoys maths tests a lot! So it seems a shame in a way.