I was always an expert test taker from a very young age. I loved standardized tests, and excelled every time.
I remember thinking many times how I was pretty sure I could do pretty well on a test on any subject, even if I didn't know the subject itself.
I had a chance to test (hah) that theory when I took a summer job at a college testing center when I was a college student myself. I would give out these tests in a number of different subjects, but I had time to kill while the students were taking the tests. I decided to try taking some for subjects I had never studied.
I scored well above the average scores on these subjects I knew nothing about, I just knew how tests were written. I could pick up context clues in the wording of questions, use my experience on how test questions usually go, and use clues from other parts of the test to figure out how to answer a different question.
That doesn't mean I was any good at those subjects, I just was good at that form of test.