Our FAQ posted by Siva has all the details (thanks Siva).
But to clarify, in order to be Zachman Certified, we are requiring Architects to take the courses. It is possible for one to take the
test through the ICCP without taking the courses, however that person will not be designated "Zachman Certified" unless they take the courses through Zachman International. It is the only way that we can control what people actually know and how much they truly understand.
Incidentally, there are a lot of people who think they understand the Zachman Framework, but after taking the courses, they come away with a whole new perspective and realize it is far deeper then they ever understood.
Hope that helps!
-John Zachman
(Son of Zachman Framework Originator)