I’d argue English (Lit/Lang), Maths, Science, ICT (I think in modern society it’s pretty essential to know technology at least to a basic level) and then either a Citizenship / Politics GCSE.
Outside of that, students can pick whatever subjects they wanna. Also, encorporate much better sex education, and some kind of life skills. Although I know that 2 years ago I’d have been annoyed if I had to take a class on cooking when I could be revising for exams, so 🤷🏻*♀️