Loaaaads. Most of the time, these days, a levels and degrees can lead to all kinds of funky job choices. Employers are all about 'transferable skills' rather than specific A levels per se (unless you want to be a brain surgeon or something). Just do subjects you enjoy and think you'll do well in. And for the love of all things holy, stay on top of your work. I am speaking from experience.
Good luck dude x