Hey

B. Arch is a 3 hour-exam based on Mathematics, Aptitude Test, and a Drawing/Sketching Test.
For Mathematics you should go for NCERT textbooks only and clear the concept before moving on to the next topic.

Drawing is the easiest part to score 70 marks. Try to Focus on Three-dimensional perception part more. And concentrate on analytical reasoning. It depends on imaginative questions for which one must be good at solid transformations and visualizing of solids in different views.

I would recommend you to take mock tests regularly to develop pace and practice and analyze them the same day.

All the best!