M.Arch

If you fail in one subject, you need to take the exam of that particular subject. If you fail in 3 or more subjects, you need to appear for the exams of all the subjects.

No, you cannot at least in India. Here those two are considered as whole different branches. Architecture is not even considered as engineering.

You can apply for CAT/ other MBA exams before your graduation.

Hi, if you are looking for jobs after studies you should opt for countries having flexible work permit schemes for foreign students like Canada, Australia and New Zealand. In Europe, you can explore Germany, France and The Netherlands. Asian giants like China and Hong Kong also have good opportunities.

Hi, Every college is different and hence the fees will vary accordingly. Please confirm the college name in which you wish to apply for better understanding. Regards.

Yes, through Management quota, the student can get admission, if he has written PG Entrance Exam.

Hi Ashok,
https://www.shiksha.com/architecture-planning/rural-regional/course/m-arch-in-urban-and-regional-planning-institute-of-urban-and-regional-planning-prabhadevi-mumbai-293529
Regards.

This is a very college specific information. I request you to get in touch with college authorities for details.
For more information, check link below:
http://bvp.bharatividyapeeth.edu/index.php/contact-us

Yes, you can pursue M.Arch after your Bachelors of interior architecture. There are many courses available in many public and private universities in The United States which offers Masters of architecture (3 years graduate degree programme) for candidates who do not have undergraduate architecture background. You can also contact their respective departments for detailed information about the course structure.