B.Arch

Hi,
As per Council of Architecture (COA) admission guidelines, a candidate applying to any school / college of architecture in India should have achieved 40% score in NATA, i.e. at least 80/200, for consideration of admission into first year B.Arch programme.
So, you have not qualified. I think the results for NATA are going to appear only on June 10th. So you need to wait.
www.nata.in is the website for NATA.

Yes, you might get a government college. NIT will be difficult. Go for some regional engineering colleges. Or some state universities like Chandigarh college of Architecture, Nirma University amd similar other institutions that provide degree in B.arch.
Hope this was helpful.

Go for B.Arch as you have got a good rank. You can get a good NIT for B.Arch. But choose B.Arch only if you are interested in architecture.

Find below a link that will give you the fee structure of previous years for B.Arch and you can get an idea for present year:
https://www.shiksha.com/b-tech/articles/nit-fee-structure-for-b-tech-2012-13-blogId-6033

A rank under 1500 will be considered safe to get a seat in RV College for B.Arch in NATA. You have to get a score of about 300 or 300+ in JEE part 2.

Sorry, but your rank is too high as 300+ marks are considered for admission in B.Arch. So, you should try for any private college.