Have you finished your revision?

Setting: I am preparing for an exam and a classmate comes up to me asking if I have finished my revision. The what??? I just looked at her and thought that maybe I heard the word wrong. But then she added that she was on her way to the library to revise. I did hear it right! But was there anything incorrect in her statement? Apparently not. I just learned that word revise is another term for review...another testament to the differences between American and British English (which is not limited to pronunciation and spelling)!