Architecture

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.

Yes, you can get a seat in the same campus. The chances are very high. This score is more than enough for the campus.

You can look for NIT-Warangal and Calicut. Also, the chances of getting into JJ College are also there. DY Patil is also a good option for you.

I think, NATA score is needed for the same.

No, you can't. They offer admission through NATA.

NATA score is considered.

It's around 1.5-2 lacs for a year.

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.