School is there to help everyone be prepared for the real world. Not in terms of work, but more about learning and developing in a specific field, or subject.
But it also depends on what you get into, eg. Engineering = Maths, Health = Science, Business = Accounting/Business Studies.
I'm currently working as a Paramedic, and everything I learnt in highschool.. I remember completely none of it. Literally, none of the major subjects in school mattered such as: History, Geo, Music, PE, Language etc.
Although I can't say the same about Maths and English since that's an everyday function of our brains.
Everything I learnt in University.. I remember less than half of it. Almost everything felt like it was all irrelevant when it came to the real world job. But all that which was achieved in school and in Uni is there to help you get where you want to be.