Architecture

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-cours

Hi,
Yes you may get a good college to pursue your Architecture, you will have to score 120 - 140 marks in NATA to get the best colleges in the country.

Hi,
Yes, you can definitely get admission in Sir JJ College of Architecture, you will need a score of 90% and above in your class 12th and also 120-140 marks in your NATA exams.

Hi,
You can find the details here https://www.shiksha.com/architecture-planning/nata-exam.