Hello Karthik
Your query is about which exam? If your query is about JEE Main exam, there is no re-evaluation process. However, there was an option to challenge the answer key. The facility to challenge the answer key was available from 14.04.2019 to 16.04.2019 (upto 11:50 PM).
Do let us know if you have any other query.
Good Luck!
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