Obtain your official GRE score report from Educational Testing Service (ETS). Read your percentile for each score. The percentile shows the percentage of all test-takers who scored below your score. For example a verbal score of 700 in 2009 had a percentile ranking of 97, which means that 97 percent of test takers scored between 200 and 690 on the verbal section.
Check your score against test-takers who intend on applying for similar programs. Locate your intended field on the ETS table and your score range. Identify their intersection to find the percentage of test-takers who scored within that range. Move across the row to see distribution of other score ranges.
Contact the admissions departments of the programs that you are interested in applying to. Ask for any information that they can release regarding GRE score ranges for accepted students in past years. Compare scores from prior years according to the corresponding percentile ranking, rather than the numeric score.