Hi there,

Hope you are doing well.

You do not need to worry since your admit card is lost because generally the score card is required at the time of the verification and not the admit card.

Also, if you have your hall admit card number, then you can generate your admit card from it or if you want to get the admit card then it is sent on email also nowadays.

So, it is not a matter of concern that your seat will get cancelled because of not having the admit card. Also, you can ask your further questions by sending your queries to the the jee mains officials or mail the concerned authority.

Hope this resolves your query.