It is important that you do some research before choosing your A-Level subjects. Some university degrees will only accept A-Level qualifications and some degree courses require a particular A-Level subject, e.g. you need A-Level Chemistry to study Medicine. So if you have a particular course in mind, you should check the entry requirements carefully.
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You may instead want to keep your future options open when choosing your A-Levels and select a smart mix of the most commonly asked for subjects in university entry requirements. These are known as ‘facilitating’ subjects and include: Mathematics; Sciences; English; History; Geography and Modern Languages. These aren’t essential but come highly recommended. A good website for you to research is www.informedchoices.ac.uk.