Do what you want to do.
A-Level Chemistry is really hard (talking from experience), but I don't regret doing it because I wanted to do Biochem (and I will be in 3 weeks lol)
If you want to study biological science/biology, check out UCAS for courses that only require an A-Level in Biology. Biophysics is also an option.
Languages are TOUGH (did 2 weeks of A-Level French and quit, partly because I had to go to another school for it and had social anxiety), but if you enjoy them go for it! However, if you're doing two languages and two sciences you're going to need to be super focused because they are all tough.
My advice is don't pick A-Levels for the sake of getting onto a degree course unless you like the subject.