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.