Would it help to look at a GCSE paper and see that you can't do Higher questions 'in your head'? Also there are questions where you need to give a reason for your answer - one board uses a * against these so pupils know there are marks for writing!

Good idea, I'll see if I can get one.

Geometry is also a topic where they need to not just say what the angle is but why e.g. angles in a triangle add to 180. You don't get the mark without the reason.

That might be a good place to start as he is relatively calm about those. The flash points are algebra in equations (again, he can do the ones you can 'see' 4x + 12 = 20 type as he can almost guess the answer. He can do the ones where you cancel out one side and balance them too, but we always go through much hair tearing first.....) and the other is the more 'hidden' ones like "I think of a number, I double it, I etc etc, what was the first number? Anything that needs 'steps' so that all fits with what you say.

Would he look at NRICH problems? I like the statement on there "There is a difference between not knowing and not knowing yet." Sheila Tobias

This looks like a great site, the difficulty is getting him to loom at it when he doesn't have to, but I Wil try as it looks really good. He does mymaths too.

https://nrich.maths.org/studentsDo they do the UKMT challenges?

They do a weekly maths challenge with a prize, which he avoids, but I'll print it off this week......

Thank you so much

Maths is so much more than 'sums' ...