Psychology at Edinburgh

So I’m considering applying to Psychology when I leave high school, and in Edinburgh I’m thinking about Psychology and Philosophy, since I can’t see that it’s possible to do Psychology MA by itself. They still obviously have required subjects, and I’ve noticed that all the ones for Edinburgh are heavily science based, is it okay if I only meet one of these requirements (maths), I know it says only one is required but will I be put at a disadvantage?
I study, English, maths, classical studies, French, art & design, then next year I have chosen to study advanced higher English, higher admin, modern studies, and history.
Thank you!!