Do complete the A-levels. Time is very much on your side, the jobs market is unlikely to pick up for 3+ years. Those A-levels will potentially secure you a better job with which to fund your training. Importantly, they are also a fall back should flying not work out for whatever reason. They demonstrate to a potential employer a certain amount of ability and application.
Also, get your Class 1 medical done, before you start making career defining decisions to be a pilot.