Thanks for your replies.
Scary mum - I would much rather he did 3 A levels, more than enough work involved !
But as he can't do the two which were top of his list I was just thinking of ways to get round it.
Because of his GCSE predictions he will be expected to do 4. But I don't know how flexible the school are on this.
Guest 55 - I have no idea why they have left it so late, apparently all other boys who couldn't do the choices they wanted were called in to discuss it. DS just got a slip on the last day of term crossing out German. He went at break to speak to the lady concerned and she said it was a timetabling issue but would confirm after the holidays and he would need another subject to take. It's now been confirmed and he's got until Monday to make a decision.
Hermanmunster - while I agree perhaps taking both histories is not ideal (though I have to admit my A levels were History, Classical civilisation, Economics and Art so the apple doesn't fall far from the tree ! ) it is what he wants to do. He also refuses to give up Ancient History so he would be left with 2 histories, economics and who knows what else which is even less ideal.
The last thing I want to do is make life harder for DS. And if taking German out of school would do this then I won't consider it but I was just trying to find a way for him to do the subjects that he wants.
The point is, as you say, the school expect him to do 4...therefore, if they cannot timetable him German, they will expect him to pick up another one in school - so if he is then doing German out of school, that will be 5....If the school are happy for him to just do 3 in school because he might pick up German outside of school, then just let him do the 3 in school...But I would add to the general consensus that two histories are not ideal and dropping one of those in favour of German would show more breadth.