Business related degreesWatch
All three are traditional courses so understandably they are equally difficult and competitive to get into.
However I'd say Business is more varied than the other 2 as Economics and Maths are the main elements and ingredients of what makes a business.
There's many options, e.g. accounting or economics. Accountants are always in demand and you'll see this if you run a job search on accountants. Alternatively, if you get something like A*AA you could study economics at a target university and consider investment banking as a career.
It will if you take the exams required to become an accountant (i don't remember thename of them off the top of my head). Some accounting degrees actually include them but you should double check with the university.
If you're smart, I don't recommend doing a business degree. It's not a well regarded degree if you want to earn big bucks in the city.
You are better off doing Economics, Maths or Accounting / Finance (if you want to be an accountant).