Hello,
No you can't carry your class 12th admit card for id proof as the checkers will not consoder it for verification.You have to carry your ADHAAR CARD or  PAN CARD or VOTER ID CARD or any other id proof for verification process at the examination centre.Keep care of not to go late.Reach there 1 hour earlier and not bring any other things except your jee hall ticket and id proof.
All the best!:)

Hey

No, they will not consider that as ID proof because no one validates them. It will not serve the purpose of checking the candidate's identity.
So the proofs of identity that will be accepted are the Aadhaar card, School/College ID, Driving License, Passport or PAN card.

Here, you can check other important things to be taken care of while entering the exam hall.
https://www.google.co.in/amp/s/engineering.careers360.com/articles/jee-main-what-you-should-carry-exam-hall%3famp  

All the best!

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