NATA

I think you cannot get admission in current session. For admission, the current session result will considered and as per rules candidate must have passed 12th with PCM with 50% of aggregate marks and 50% aggregate overall marks. However, you can apply for next NATA, scheduled to be held in July-2019.

The worst university for architecture, especially because of its poor classwork and professors like Anil Bharti, Rakesh Arya, Rakesh Ranjan, Admit Kumar, Vishnu Mathur, Chitkabra Rahul Kukreti, etc. Never even think about it.

Yes, there will be exam centre in Pune. Details regarding which will be mention on you admit card.

You can see all exam centres here https://www.shiksha.com/architecture-planning/nata-exam

For Bachelor in Architecture, top entrance exams is given below:
NATA
JEE Main and Advanced
AMU Arch
KIITEE
IPUCET
COMEDK UGET
KCET
UPSEE
TANCET.

Marking and ranking is not, but the final admission will be affected as there is SC/ST quota. If you belong to general category, then I don't think it will be a problem.

A minimum of 80/200 is required to be eligible for Architecture. You may refer the cut off rank of Andhra university for further details. The user recommends following institutes
BGS School of Architecture and Planning.

Your score should be more than 80 out of 200 to get a seat in Andhra University.

National Architecture Aptitude Test or NATA is conducted by Council of Architecture (CoA) whereas JEE Main Paper 2 is conducted by National Testing Agency (NTA). JEE Main Paper 2 opens the door to NITs and GFTIs offering B.Arch course whereas admission in colleges which are mainly private and colleges under trust. like SPA Delhi and CEPT University Ahmedabad is offered through NATA. All the best for your future.