Yes, it may not be fair that other people are born with a natural advantage to you, but that's not something we really have a great degree of control over, the important thing is that in situations where we do have control over the world we make sure that we make things as fair as possible, e.g. Making sure that we don't cheat. Using your "Cunning" has no place in a test that isn't meant to measure such a thing, you're just misleading and deceiving for your own ends.
As for the idea of flipping burgers vs. Going to law school, you're being reductionist and ignoring vital pieces here. Refraining from cheating doesn't mean that you can't get a good education and you're going to end up in a bad job, and the people who are able to get into prestigious educational establishments don't all do so on the gifts they're born with, there's also considerable focus on how much knowledge they've acquired and how determined they've been in their work, and a system that aims to reward those who work hard and learn more seems like a pretty good nod in the direction of building a fairer world.
As for the "Cheating is unfair, but life is unfair" argument, I just don't feel like that makes any sense. If I can show you one object coloured slightly orange and another object coloured a deeper orange, does that mean the first object isn't somewhat orange? Of course it doesn't. If something's unfair then it's unfair, no matter how fair or unfair the things surrounding it may be.