B.Arch

Hi,
Yes, there are so many like MIT in USA, University of Cambridge UK, NUS Singapore and many more. Be specific with the country and you will find numerous options. You can check the requirements and take the entrance exams accordingly. The only problem you might be facing is that you have a BCA degree and now you want to do B.Arch. You can draft your essay accordingly.

The entrance exam for this course will be conducted in April 2019.

There is no problem at all, as both papers are independent of each other.

Hi,
You need to score really well and end within a rank of 600 to get admission in NIT's, IIT's, SPA's, CEPT or Sir JJ College.

Hi,
Yes you may register yourself for NATA exam, qualify in it with a good score to be admitted in a good college. https://www.shiksha.com/architecture-planning/articles/be-an-architect-know-courses-to-study-jobs-opportunities-blogId-19353.

Hi,
Yes, you are eligible to study B.Arch, you will have to write NATA exam and score well to get admission into a good college.

Hi, you need to write JEE Paper 2 and get a good score with a good percentage of about 80+ to get admission in SPA.

Yes, Bachelors in Architecture is the most trending course. Architecture has a lot of scope in developing country like India which needs to add Infrastructure in the next few years to be among the super powers by 2050. https://www.shiksha.com/architecture-planning/articles/be-an-architect-know-courses-to-study-jobs-opportunities-blogId-19353.

Hi Sagar,Please find the link below:
https://www.youtube.com/watch?v=9HNVH9lePFw.