Our school teaches business, but its a soft subject that noone takes, anyone whos good at maths sails through it, if youre good at maths you can manage your money

Also managing your money =/= business, business is selling goods or services to make money. Very few people use business (are entrepreneurs) as a day job so I would maintain that maths is more important

also i would not call the sciences random, a very large proportion of university graduates do science based courses and therefore will use at least one of the sciences at uni and probably also in their day job