What after 12th commerce board exam?

To get into Architecture in India you need to have Maths, Physics and Chemistry as your major subjects in 12th as it is considered equivalent to Engineering. So getting into Architecture with a Commerce background would be difficult. Entrance exam for Architecture is the same as the Engineering exam along with which you might have to write additional paper which involves sketching and design. So you might have to opt for a different program for your higher studies.