If I take a Kaplan practice test and get 8/30 on the organic chemistry section, that is considered to be a 250. If I get 8/30 on the Achiever test, that is considered to be a 270. Which one do I believe?
Take either with a grain of salt -- it all depends how you do relative to others. In some versions of the test, an 8/30 might be a 250 and in others it might be a 270. Use the scores as a relative gauge of where you are