Here's an update I wrote fairly recently on how DS's maths is handled (you might find the rest of the thread interesting too if you didn't see it at the time). Since then he's finished the specific textbook and book of problems that I mentioned there. On the problem solving side he's currently using past papers of the UK Mathematics Trust's Junior Mathematics Challenge (some are available from
here). On the new material side, he's desperate to learn calculus so that's next on the agenda. The other change since then is that his problem-solving sessions with the head and this other boy have fallen by the wayside; I'm not sure whether that's just because the head has got busy or because they weren't working, but as DS doesn't seem too bothered I haven't made waves about that.
