Hey there
As I have searched, the counselling process for document verification will be notified by institutes individually. For more details related to NATA click on below mentioned link:
https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/exams/nata/amp&ved=2ahUKEwjSieTntajzAhWpILcAHSuaB5cQFnoECBEQAQ&usg=AOvVaw1Ig3TpLuxTyzioej5_5DGi&cf=1
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