AP test woes

Hi all.

I'm enrolled in AP Calculus AB at my school. However, for months I have been learning calculus on my own. First and foremost I simply enjoy math, but an added bonus was that I would be able to take (and pass) the more advanced Calculus BC test instead of the AB test at the end of the year. I was then planning on taking Calculus III at the local community college over the summer.

I signed up for Calculus BC a few months ago. Now today I learned that my teacher and counselor assumed I had made a mistake and ordered the Calculus AB test for me. I talked to them about it as soon as I could and although my counselor is sympathetic, the College Board is a huge bureaucracy and may well prove to be inflexible in allowing them to order another Calculus BC test this late. Thus I won't get out of Calc II and won't be able to take Calc III over the summer as I had planned.

Assuming the worst, what can I do to remedy this situation? Will the college be flexible with their prerequisites? Is there a way I can prove to someone that I know the material and be allowed to take third-semester calculus as planned? What can I do?