What Batman said would make sense as to the difference, but it says on my result page that, "Scores on this examination form were updated using a pre-equating sample of 25,034 examinees tested in 2001-2002." So I assumed that meant that was the group we all were compared to, but now I am not sure. Maybe some scores are based on those you tested against, like the composite, and some are compared across the country? I have no idea. It also says, "Percentile norms are based on performance of:" and then it lists three different groups, diploma, ADN and all applicants, and then it lists the amount of people in each group, the number of programs, and the number of states. So after writing this I am thinking that maybe the percentiles are based on this larger group and maybe there is a different score for people you are testing against? I think I am making this way more complicated than it is!!

But my overall impression is that it is based on more than just the people you sat next to for the test.
I received a 49/60 on verbal (92nd percentile), 38/40 in math (98th percentile), and 48/60 in science (97th percentile). It put me in the 99th percentile overall and a composite score of 148.
Not sure if that will help since we don't know what we are being compared to, but maybe someone will figure it out!