The subject you study at university will determine what your next few years will be like and may have a big impact on the career you choose. These questions should help you decide on a subject that's right for you...
This doesn't just mean picking from your A-level subjects, though. There are many university courses that don't have an A-level equivalent, or don't require the relevant A-level, from Law to Outdoor Studies. Think about your interests outside the subjects you study and research the relevant courses that are available.
For other careers, it may be more difficult. If you're not sure what the right path for the career you want, try researching it on Prospects, or ask around to see if you can get in touch with someone working in the same area who can advise you.
Try to go to subject-specific open days and make the most of them by reading the prospectus carefully and talk to former students about the course. This is particularly important if you're planning on studying a subject that's new to you.