I only have my uco bank passbook with photo address proof.Will I be allowed to appear for jee main 2019 on 12th January?
When you register did they not ask you to fill your adhaar number?
If you have registered for adhaar than you can download it from the site.
I think your adhaar card will verify at the entry gate or any other identify proof.
If you never applied for adhaar
You still have 10-12 days you can apply for adhaar now and you will get soft copy from the website.
Otherwise if you will not get it till exam you can take your school identity card and passbook along with it.
You can mail to the committee for this problem.
Good luck.

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