Good luck with your degree.
The Association of Bookkeepers is I think the IAB? We are the ICB so I can't answer the question as asked - however for the ICB if you ring or email they will be able to tell you if you get any exemptions from our exams and what those exemptions might be.
You might also want to consider student membership while you are studying - you could go to local branch meetings and get to meet bookkeepers and accountants who practice in your area, a useful resource if you get stuck on an assignment! As a student all your work for the charity would need to be overseen by a fully qualified bookkeeper or accountant.
The email address you need is firstname.lastname@example.org and the phone number is 0845 060 2345