Interestingly enough, the GMAT used to offer it when it was a paper-based test.
Rescoring Service
If there are any discrepancies between your self-scoring results and those on your score report, you may request that ETS rescore your answer sheet by submitting the appropriate fee and the form for this purpose your GMAT Examinee Score Interpretation Guide. But first check your answer sheet from incomplete erasures or light or partial marking, and check your calculations to be sure that they are accurate.
