I dont think doing 2 languages is a good idea since it might get confusing, unless your looking to do languages in the future. The best thing to do would be to figure out roughly what you want to do in the future (like would you want to go into science or something business related or maybe humanities) then look at what a levels are typically needed to get you there. Some courses dont even ask for specific alevels just the grades so you could pick the ones you know you'll do good at.