Hi Sangeeta,
don't worry! I am attaching a link below where you have to enter a reference number and you will redirected to a page from where you would be able to download your hall ticket again. Kindly note reference number is the number present after hyphen (-) in your NSTSE order number.
LINK:
https://www.unifiedcouncil.com/Nstse/admitcard.aspx
Thankyou!
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