Hi Aspirant,
To get your documents from cbse office you first need to fill an application form and duly submit it with prescribed fees. Your documents will be issued after two weeks from the date of receipt of application form. You can Collect it from the office or pay an extra amount to get your documents bypost.
You can visit the following link for complete guidelines:
https://cbse.nic.in/newsite/dup.html#guidelines
All the best
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