If you want to stay in school and like classroom learning, studying for an A level is the way to go.
It is important to note that you are not compelled to attend the same sixth form college. Subjects not taught at your school may be accessible at another sixth form institution.
If you want to go to university and get a degree, the typical route is to first complete GCSEs, then A levels, and finally university. However, if you take the apprenticeship option, you may still be able to get a degree. Some intermediate and advanced apprentices proceed to the top of the apprenticeship ladder, where they complete level 7 courses that lead to a master’s degree!
But you are unable to do A levels and an apprenticeship at this time.