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Just some late words of encouragement for those taking the January exam. I tested in November and during the first section (LG) I was interrupted by the proctor 3 separate times, and not once did she pause my time. Because of this, I was unable to answer the final two Qs of the section. I was very frustrated because I was PTing at -0 to -1 on LG and believed I needed to match that on the exam to have any hope of achieving my goal score. As the next section began, I tried my best to put the disappointment behind me and focus on the rest of the exam. I’m glad I did because I remember feeling very good about how I did on the remainder of the test. And lo and behold, when the scores were released, I receive my exact goal score. Obviously, if you encounter some major issues, you are likely going to want to appeal for a retest. But if you hit some obstacles along the way, just try your best to put it behind you and focus on what’s still ahead. You never know, things might just work out in the end. Good luck!
Think of percentiles not as averages but as values at which a certain percentage of a data set is included (and thus a comparable percentage excluded). Percentiles simply separate values below a certain value from those above it. At GWU, this means that 25% of students scored below 159 and the remaining 75% scored at or above it. Similarly, the 75th percentile shows that 75% of students scored below 167 and the remaining 25% scored at or above it. From just these two values, you cannot accurately know the 50th percentile because you know nothing about the actual scores of everybody between the 25th and 75th percentiles. You just know that 50% of students scored above a 159 and below a 167. So while the 50th percentile will be the median of all the scores, it is not the average of the 25th and 75th percentiles (it could be, but that is not what it is intended to represent).