Hello,
As of now there is no information regarding extenaion of registration dates for jee mains 2018.But if you haven't filled you can fill it till 12:00  today.If you want to make any correction in your jee mains application form then you can do it in 2nd week of January when correction window will be available on jee mains website.You can correct all your details except mode of exam,aadhar card related details and language of exam paper of jee mains.
Good luck.

Joint Entrance Examination (Main)

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