Sounds very familiar to myself. The problem was our school kinda plopped it in between two of our larger "do or have to redo during step studying" exams so there was no real time to study for this one in fear of losing time later. The majority of our class hit between 160-180....
Think about it this way, do you remember all the behavioral sciences stuff (formulas, the definitions of different types of study, PPV v. NPV, etc.)? Did you read the question and remember- remembering the answer? Did you study as hard for that test as you do for other tests? Did you do 1000s+ questions in preparation for the test? Does your school "really" try to make their tests like the NMBE exams? Did you take it as SERIOUSLY as you would the real one (skip questions and go back, or just answer to get it over with)?
Basically the way I've figured it out is that's your score with zero studying, meaning it is a true measure of your basic knowledge...and guess what? You technically only missed passing by 5-6 points on the NMBE. Now is it the 240-250s you see on SDN? No, but those people studied for a long time before taking the big test. Plus, they had nothing else to worry about like making sure they pass the rest of second year on the first try (which is just as important in proving you're competent).
You have 6 weeks. Study like you would for any regular exam and the "freshness" of formulas, basic concepts, and the systems will surely move your grade up. It can go incredibly high if you work hard. You'll have nothing else to worry about and you'll be able to rest up the day before (unlike trudging along in class normally and then getting a "day off" to take a practice test). Don't doubt yourself, shoot for as high as you can.
