No idea! It was certainly fairly segregated when I was at school - after 11, anyway. History was history, and geography was geography, and English was English etc. Different classrooms, different teachers, different colours of exercise book. And my Mum often used to claim - and probably still does - that she couldn't do something "because it was maths", before my Dad pointed out that she not only could do, but did it daily - e.g. in the context of working out cooking times. ("But that's not maths!" she'd say. "It's cooking!")