Usually the marks doesn't change much. If you have written well in the exams then may be you can give the papers for revaluation. If you are trying to push some marks so that you could pass, then sorry but it's not the worth. If you feel that you could get atleast 8-10 more marks then give it to revaluation. Buy it you want a few marks so that you could pass, then maybe you wouldn't be happy with the results.
Hope I helped you with your doubt.
Nitin Yalamanchili, MBBS from Akash Institute of Medical Science and Research Centre Devanahalli
Source: Quora Digest