Yes, some people are just really good at tests -- I'm one of them!
I have always liked tests, and I can pass a test on something I don't even know. Case in point, I got the highest score the recruiting office had ever seen when I took the ASVAB (aptitude test for military) in high school -- my best score was in electronics. I grew up in an electronically-gifted family, but my mother and I always walked off shaking our heads when "the boys" started "speaking electronics", and I knew next to nothing about it. Yet somehow I nearly aced the test. I have no idea how -- I just have an understanding of tests.
It's much more useful to be able to pass a test without knowing the stuff than the problem so many other people have, which is knowing the stuff and freezing up on the test!
