Unless you have a vocation already picked out to work towards, then the choices you make now will have no impact on your life.

What I would advise you, is do A-levels that cover subjects that you're interested in, not that you think will cover your bases. I followed an educational path through A-levels and uni, but I have utilised zero percent of the things I learned in my work life.

Seriously, don't stress yourself out too much. Do things you'll enjoy learning about until you have a clearer idea for your own future.