Hello Utkarsh. You can check all the information regarding reserved categories in the link given below. Regarding the dates to go for document verification, you can check on the official website of dtu else enquire with your friends applying for the same. Good luck.

https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/articles/jac-delhi-reservation-criteria/amp&ved=2ahUKEwjGseDyh8bjAhXaXisKHUjgBe8QFjAJegQIAhAB&usg=AOvVaw14cEACGmUJI7hBcn1cJmCz&ampcf=1&cshid=1563713843802