If "F" stands for fitness to run, What do the A exam, B exam, C exam, D exam, & E exam stand for SFE?

F is the largest and longest exam of a whole series. I don't have the details to hand or I would post a comprehensive answer to the question. I have the details in a back number of Rail somewhere, I also have over 250 copies of that magazine to search through so don't anyone go holding your breath waiting for the answer from me.
Regards, 62440