"I wish I had chosen more science subjects because it would have allowed me a wider range of university choices when I eventually realised that law was not what I actually wanted to do."
“I chose my A level options with an Economics BSc in mind. To guide me, I took a look at various university prospectuses and their entry requirements. Some helpful ones (such as LSE's) actually advises on 'facilitating' subjects.”
A-levels are a big jump up from GCSE; it's vital that you enjoy your subjects in my opinion. If you don't love them, what is motivating you to study hard?
My tip to everybody is to pick what you enjoy most at the time you are choosing your A-levels; you cannot predict the future! Chances are you are going to go on and study a degree in something you enjoy.
I didn't do some of the things I loved in order to take subjects that were more desirable to universities, not realising that for the vast majority of students the truth is it's better to have top marks in three subjects you love than mediocre ones for three that are considered good.