Hey
CBSE will open the facility to make corrections to the JEE Main 2018 application form tentatively in the second week of January. Using the JEE Main 2018 correction facility, the candidate will be able to correct a host of details in the application form, including the mode of exam from offline to online, particulars like the medium of examination, and paper the candidate wants to appear in JEE Main. It may be noted that the JEE Main application correction facility is open to only those candidates who have paid the application fee and completed the application form in all respects. To make the corrections, the candidate will have to go to the JEE Main application correction portal and log in using details like JEE Main 2018 application number and password. JEE Main Photo Correction 2018 is also open now.
Source: https://engineering.careers360.com/articles/jee-main-application-form-correction