Dear gaurav,
After realising the results of written exam on 10 dec 2019 there no any update provided by the exam conducting authority .so please visit the official website of KVPY regularly for regarding upcoming dates and events regarding interview.
Document required at the time of interview of KVPY-
if you want to know more information about the kvpy then you can go through the below link
https://school.careers360.com/exams/kvpy
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