B.Arch

Hello Siva Priya,
The cut-off score varies every year from each category to the other. So, it is difficult to predict the scores. You need to wait till the rank list is released so that, you can know your chances.
All the best.

You can choose B.Arch colleges at the time of counselling.

Yes, you can get a government college for B.Arch.

Maybe you can get in lower NITs or in Eastern part NITs. If you don't get in JoSAA rounds, surely you will get in CSAB rounds . So do the choice fillup smartly.

No, there is no admission on the basis of merit because the basic eligibility for Bachelor of architecture is the candidate should clear NATA (National aptitude test in architecture) with the 80% marks conducted by Council of Architecture.

No, through only JEE Mains Paper 2 or NATA score you can get admission.

Yes, you can apply for the same. This campus accepts the JEE Mains scorecard. So, keep going.
Best of luck.

Yes, you can look for colleges under Annamalai and Bharathiar University. They offer courses with less fee and a large number of seats will be always there.

No, you have to crack the entrance exam conducted by Anna University.

The selection is based on your JEE Mains Paper-2 Rank. Last year (2017) Closing Rank for: Chandigarh Candidates : 7910
Non-Chandigarh Candidates: 2362
So if you want to get admission you need to be under the cutoff rank of JEE paper 2 then only you will have chances to get into Chandigarh college of architecture.