Hi Leelavathi,
B.Arch. is part of Paper-2 of JEE-Mains and will be a separate paper than the one for B.Plan this time, owing to the new paper pattern recently released by the NTA. it is out of 400 marks. No matter how much of the paper you attempt, you will still be marked out of 400 marks.
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile