Maybe some impostor, but at the time, there was a penalty for guessing. Between my risk-taking personality and the sense that I wasn't going to get out of the minor leagues by watching pitches go by, I 'swung' at every question and apparently got a lot of questions right that I couldn't actually explain why the answer was correct.
Arguably, someone who knew more than I did but was too hesitant to go out on a limb about it should still have gotten a higher score if the test is designed to assess knowledge.