As a retired academic looking back..... I went to a very unambitious girls school where the aim was to keep us away from boys and prepare us for marriage to local farmers sons. None of us did GCSEs or even CSEs. I left at 15 and got a job and started evening classes in the academic subjects I'd missed. I must say there was one teacher who tried to get us to think for ourselves and she was probably the main influence for my future career (she was sacked unfortunately, I imagine for being unqualified and unorthodox). In terms of a subject, I have to admit I'm pleased I can cook and sew and domestic science, despite not being aimed at qualifications, has been the most useful subject I learnt at school.