Should I do biology A level?Watch
Why would you be thinking of doing 5 A levels? It's an awful lot of work for no gain - no university will make a standard offer of more than 3 A levels, and by doing 5 you risk doing less well in all of them.
Btw at my skl we have to do 4 and they're recommending that I do fm as well
If you pick Biology, Chemistry, Maths and Further Maths, you'd have an excellent combo for Medicine.
The traditional three sciences plus maths will keep the most doors open but you should have a think about which area of natural science you really want to carry on studying.
Also as general rules of thumb:
Don't take Physics without Maths
Don't take Computer Science without Maths
Don't take Biology (full A Level) without Chemistry