Well to get the admit card for the Junior Scientific Officer you can follow the below process

Visit the official site of the UPSC online

A page like below will open

http://upsconline.nic.in/
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Hit on the option for the online application for the recruitment at the center

You will be seeing a page like below


Here you will find the link for the admit card for the Junior Scientific Officer when available

Hit on that link

Enter the details and you will get the admit card