As others have said, pick things you enjoy rather than what you think you should study. Universities will let you in to just about any course if you have good qualifications in English (and maybe Maths too - but in Scotland Maths was no longer required, I don't know about elsewhere) and in any other subjects. So it doesn't matter if you come to apply for uni and think "I want to study politics" and you chose English, Art, Chemistry, Religious Studies etc... so long as you have good grades, you'll get into the faculty within the uni you want to apply to and you can do whatever you want to do.
It works differently in Scotland, but when I sat my important-for-uni exams, I was studying English, Maths, French, German and Modern Studies. I'm now about to start writing a dissertation about the oil and gas industry in Russia. I didn't do any Chemistry and I didn't do any History. Go with what you enjoy and you can figure out the rest later
