Hi Farhan,
Yes of course, B.Arch graduate can become a commercial pilot with having good command over relevant skills. There is no any special preference given to B.Tech student over B.Arch student.
You need to pass in only Physics and Mathematics in class 12th. Even if you have not passed so than National Institute of Open Schooling is open for you.
For being a commercial pilot you need to clear the DGCA commercial pilot license exam.
All you need to have is relevant skills and passed from physics and mathematics subjects.
Hope you got the required information.
All The Best!!
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