"GRE score reporting is cumulative. Current GRE Board policy states that your scores are reportable for 5 years. Your scores are retained for the 5 testing years following the testing year in which you tested. All scores earned during this time will be reported to each institution you designate. You may choose to send only General Test scores, only Subject Test scores, only Writing Assessment scores, or any combination of the above, but you may not choose to have only those scores from a specific test date reported. Your score report will indicate your designated recipients and your cumulative record reported at that time. However, your designated recipients will not receive information concerning the other score recipients you have chosen."
So all of your scores for the past 5 years are reported. However, at the end of a test, you may cancel a score and nothing is reported for that test. I presume you may take several tests and then cancel the scores. Has anyone done this?
This way, one could take several actual tests for practice.