how can i prepare for nid and crack it successfully
Just get over the misconception that Drawing is everything and without drawing you won't be able to crack it. Just get over this and you will do great.
Though good sketching is essential, the questions are framed to judge a candidates creativity, imagination & visualization skills/ observation / general awareness etc.
Just be aware of what is happening in the World and especially or country.
Go through all previous papers of NID.Solve at least 8 - 10 past papers within the time limit.
Read books / magazines & develop a genuine passion for your field without mugging up the Gk books