Because this analogy doesn't paint the picture? Maybe you can suggest some real life experiences that would relate to the situation.
If not belittling analogy seems kind of retarded.
I'll give you a real life situation:
I'm the LHW champion of the world. I'm the best fighter in my organisation. I have never been in any trouble in any fight. I have defeated the last 4 champions with no trouble at all. I have the wingspan of a condor. My opponent drops out but I'm am fully trained and ready to go. I get offered a fight against a MW dude who I really dislike and has not had a full training camp.
And you compare the above to getting your exam switched at the end of an academic year.
Are you really expecting any serious debate?