My DS wants to do Maths, Physics, Chemistry and possibly Biology for his A'Levels - a fairly sensible group for anyone wanting to go into science, I would have thought.
But he can't because Physics clashes with Biology and Maths clashes with Chemistry.
There are other odd clashes too - English & History, Dance & Drama.
I know they can't please all the people all of the time but.......that's a bit strange, isn't it?