I didn't get taught derivatives, functions or summation in the UK at GCSE-level (16 year old). I believe it was covered at A-level (18 year old) but you could

I didn't get taught derivatives, functions or summation in the UK at GCSE-level (16 year old). I believe it was covered at A-level (18 year old) but you could only pick three or four subjects for A-Levels at the time, so you had to be selective about the subjects you picked depending on what you "want to be when you grow up", and what you thought you were good at so that you got good enough grades to go to a uni you liked.