For a language degree, the only A level subject requirements are usually a relevant language - and be aware that you can often study a 2nd language 'ab-initio' - from the beginning - without an A level in that language.
Languages can also be combined with many other subjects at Uni so you could do 'French and Politics' etc, or there are multi-subject degrees like Liberal Arts or 'Combined Honours' where you can take units in a range of different subjects, and there are also degree subjects with no specific required A levels subjects, like Law, Management etc. And - most Unis offer extra-curricular language classes so that you could catch-up on any languages, or learn new ones, alongside a degree.
So - what you choose to study at A level does not necessarily define exactly what you might study in Uni. Look at the A level course materials if you can - ask the relevant teachers - and look at what each subject covers. For instance, what specific topics does your school teach within Politics, what are the set literature texts with French, and do these actually interest you? You will get presentations or an Open Evening about this later in the year, so there is no need to panic about subject choices right now - and most schools will allow some wriggle room if you later change your mind or if you want to switch your choices once you have your GCSE results etc.