I have not written the name and date on my passport size photograph attached to jee mains application form
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No that's not a big issue as at the time of verification at examination centre the examiners will only verify your photograph.However you can edit it when jee will provide a link for correction on their website.
All the best!:)
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GO to :
https://www.jeemain.nic.in
and on the left side there is tab called remove despracny from photograph.You have to correct your photo from it.
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