A job that offers new experiences every month/week/dayWatch
For example, it can be jobs where there is lots of interaction with people because 2 days are never really the same.
If you want you can relate the job to these three subjects: Maths, Physics, Computing
the one thing that comes to mind is MEDICINE! meeting different people every day, making a difference in the world, and no two patients are the same! and if those are your a-levels, there are a surprising number of unis who will accept them instead of biology, chemistry (Manchester, Leicester etc).
Paramedic, occupational health and district nursing also looked like quite interesting jobs to me with some variety to them.