Cuttack

Refer the link:
https://www.shiksha.com/science/colleges/colleges-cuttack.

Hello,
You can change your NDA Examination Center, but if I say it genuinely it is a very strenuous task. First of all you need to contact UPSC [But keep it in mind that you need to have very prominent/solid reason for that why you want to change your examination center. You need to have a very convincing behavior when you are approaching them, because chances are rare.
Hoping that you will get your desired center.

Hello Birendra,
I think maybe you will or will not get admission with 79%, if you belong to some backward category then you may get the admission but in general category it looks impossible.

Here, you can check all the cut-off ranks for this university:
https://www.shiksha.com/university/ravenshaw-university-Cuttack-52514/admission

Both the universities are good. National Law University is a government college and Lovely Professional University is private. If you want to get good academic performance along with good infra then you should go for LPU and if you want a government degree then go for National Law University.

Both are nearly same, but Piloo Modi is only for architecture and it is better there. If you do B.Arch as it is better, although its private, it is the best after NIT Rourkela and IIT Bhubaneswar in terms of architecture.