Take Away My 'A' ? Hey!

Last week, I spent a large amount of time studying for a test which was to be given on Friday. When Friday rolled around I was more then ready for this test. So prepared, in fact, I was the only one in class to receive an A. Turns out this A is not going to count. My classmates received a C or lower, so my teacher scratched the test and decided to have us take a home exam instead. I pleaded strongly to let my test grade count, but he said it wouldn't be fair to the other students. Is it fair to require my time be spent studying for a test which will not count? What a rip off! ...but that's High School.