You should guess when you take the test. This is not cheating it is simply intelligent test-taking.
WHAT IS A GOOD SCORE
To get an idea of how your scores compare with those of other test takers, you should look at the percentile ranking. For example, if a score of 640 ranks in the 94 th percentile, this means that 94 percent of the test takers received scores lower than 640. If a score of 500 is in the 50 th percentile-i, e,. 50 percent of the test-takers scored lower than 500, and 50 percent scored higher than 500. In general, a score above 600 is considered to be excellent, whereas a score below 479 is weak