B.Arch Eligibility

As such, it is not fixed. It varies from year to year, depending upon the toughness of question paper and no of students appearing i.e competition.

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, you are surely eligible for B.Arch in Jamia with your 56%. Try your best and participate in the entrance exams of that course.
Best of luck.

To take admission in IIT, you need to qualify JEE Main paper 2 that is for B.Arch. Then, you need to qualify JEE Advance. After that, you will get the chance at JEE Advance AAT i.e. the Architecture Aptitude Test. After you qualify AAT, you will get the seat.

Hi, Physics, Chemistry, Maths are made as mandatory subjects for architecture eligibility from academic year 2019-20 onward.

For admission in NIT, candidate must appear for JEE Mains. Unless you appear for the entrance exam you won't get admission in National Institute of Technology. The eligibility criteria for entrance exam is 12th with PCM as the subjects.
Apart from IIT and NIT, most colleges in India offer lateral entry for diploma students. These colleges do reserve some seats for lateral entry students.Diploma holders are not allowed for JEE Main admissions but they are allowed for JEE Advanced. So they can write the JEE Main exam just to qualify for JEE Advanced.

Yes, you can pursue B.Arch by distance. You will get direct admission in 2nd year. Hope this helps you. Be free to share any problem you have.
Good luck.