Just because the content of A-Level Maths is largely irrelevant to the vast majority of jobs/careers, it doesn't mean it's not useful to most people. The vast majority of maths graduates make no use of their degree when they start work, and weren't employed because of what they specifically learnt on their degree - but rather because someone good at maths tends to do very well in a lot of jobs. That said, A-Level Maths shouldn't be compulsory, instead education in this country needs to catch up and a significant portion of A-Level Maths should be taught at GCSE level.