Hi Madhuraji,

I understand that you have by mistake entered the wrong paper code and also have your report generated and now to answer your question, since you have not mentioned the name of the entrance examination or institution thus my answer might not be absolutely accurate. So firstly you have to inquire if there is a correction window to rectify your mistake, if there is no correction window then you can address this issue to the competent authorities through post by essentially stating your issue and request a quick remedy. But do keep in mind the chances of this getting solved is low as the report is generated as mentioned by you.

BEST WISHES!