I took this test almost a year ago, and ended up with a below-average score (93 if I remember correctly). That confused me until I figured out what was up with the scoring system. I tried it again, giving all the same answers, except selecting the most extreme options on every scale question, rather than the varying and often moderate options I had chosen the first time. This made my answers nonsensical for some groups of questions, but it raised my score to 153 out of a possible 155.
That's to say that more decisive people, or those who see things more in black and white, probably have an advantage on this test. The scoring favors those who tend to disagree or agree to the maximum or minimum, rather than doubting their answers and therefore selecting the "slightly agree" (and like) options.