NATA

You should get more than 100 in NATA and 200 above in JEE to get a seat in JJ College.

Go through this link to find out your answer. This is shiksha's official college predictor tool based on previous year's data. Hope this helps. All the best.
https://www.shiksha.com/architecture-planning/colleges/b-arch-colleges-india

Hi buddy, you can use this link to check out your chances of getting college in Andhra. This is Shiksha's official college predictor tool based on previous year's data. Hope this helps. All the best. https://www.shiksha.com/architecture-planning/colleges/b-arch-colleges-india.

For admission in Jadavpur University, architecture department WBJEE GMR(General Merit Rank ) is necessary along with qualification in NATA. That means only NATA score is not enough for admission in B.Arch, you must appear or have had appeared in WBJEE and secured a good rank. FYI last year i.e. for 2015, opening and closing ranks for general category were 861 and 4767 respectively.
Hope it helps.

Yes, you can get a seat in RIZVI College of Architecture.This score is enough for a seat in the same campus.

Yes, they are but with maths as a compulsory subject in their high school curriculum.

For admission to B.Arch course, you need a valid NATA score. All the architecture colleges require a valid NATA score for admission to architecture courses.

Yes, but I think you may get a little more in trouble in admission because if any more good scorer comes then it might hamper your chances in getting a college.

With the marks in JEE it's quite difficult to find a seat in colleges like SPA, NIT, Jamia Millia Islamia or Chandigarh College of Architecture but you may try your luck with CEPT Ahmedabad.