Hello,
Till now cbse has not announced officially any dates for correction of particulars on jee mains application form.But according to previous years.It may start from 2nd week of January most probably.You will be able to change/make correction after login into your accoun on jee mains website.You can edit all your details except mode of exam,aadhar card related details and language of exam paper.
Good luck.

CBSE has announced the JEE Main photo correction and the signature correction window from December 8 onwards to rectify any mistakes made by candidates. 

If there will be any discrepancy in your image CBSE will send you the message related to it and then you can edit it. 

 

For other correction option will be available tentatively in second week of January.

 

You can change the following below options

1- Change in mode of exam: The candidate will be allowed to change the mode of exam from pen & paper to computer-based, but the reverse will not be allowed.

2- Aadhaar card details

3- Medium of exam

 

For more information you can refer below link

JEE Main Application Form Correction 2018

 

Good Luck!!

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