There are lots of opportunities to gain more knowledge of beekeeping via the WBKA modules.
If you would like to progress further there are a range of exams and practical assessments that you can take that will ultimately lead to you becoming a Master Beekeeper. More information can be found on the BBKA website.
If you do want to take an exam talk to the WBKA training officer (via the secretary) about arranging a study group. Many of us have been through the pain of revision already and we can provide you with tips and point you at useful resources.