In my experience, some days/tests, I am just reading the questions really well if that makes sense. I am in a similar boat testing around 170 but have had a couple tests at 178 and 179 that stood out. I would say see it more as your potential than as luck. Something that did happen to me was after the 178, I got pretty upset with myself for not meeting that every PT which made the study process disheartening at times. My suggestion would be see it as a possibility but not an expectation.