I did A-level Philosophy, and it's an interesting subject, but a nightmare to revise. People think it is all about debating and critical thinking, which is partially correct, but there is a substantial quantity of revision needed. Most of your time will be spent memorising content, and there's A LOT of it. It was quite different to what I expected. Of my A-levels, Philosophy was probably the easiest (content-wise) but, by far, hardest in terms of the amount of workload. I'd look at uni requirements for your course, as you don't want to limit yourself now and be surprised when you can't apply to a certain university because you don't meet requirements. Best of luck!