A level BusinessWatch
If you want to study a business related course at university, you do NOT need A'level business at all. This is a mistake many people make. They will teach you everything you need to know from scratch at university.
You may however, need A'level Maths to study a business related course at university depending on what it it eg Bsc Accounting, Bsc Business and Finance, Bsc Economics etc so you will need to look at the course requirements for your preferred course on the university website.
Because its a very competitive area, it will be worth your while to study it at a very good university or as best that you can get into.