When I was at school, a friend did 3 years of A-Levels (I think he resat one year) and then afterwards, he applied to train as an accountant at a local firm. You could do A-Levels, and then afterwards look at accountancy training schemes (train you on the job) or go to university and study accountancy or another subject that interests you. Having A-levels will open up more routes for you in the future.
Does accountancy really interest you? What is pulling you to doing an apprenticeship after your GCSEs? You could also ask your school to see a careers advisor if they have this facility.