Cumbrianmale56
Depends what you want to do in adult life. People who go into engineering would say maths, physics and design technology, someone who became a musician would say music and maybe a foreign language like German if they wanted to be an opera singer. It all depends.
History has been my passion most of my life and was the most important school subject I studied.
It has had absolutely no relevance to how I have earned my living. I went from school to university, where I studied economics and that is how I made my living.
I would say that probably half the population have working lives that are not dependent on subjects they studied at school.
Shop assistants, care workers, lawyers of all kinds, and that is just to start. My DD left school to go to drama school, but ended working in the media, and now in banking (not as a banker). My son is an archaeologist. Neither of them dependent on one specific subject, beyond a good broad education.