Hey Gitumoni Baruah,
Yes, UGC NET 2018 Admit card for the December session is available. Check the admit card immediately as the details are filled correctly or not! If there are any disperancies you can comtact the help line. You can download the admit card from the given link below,
https://ntanet.nic.in/ntanetcms/public/home.aspx
All the best!
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