The answer depends on you entirely. You can give Nirma University a slip if you are getting offers from NLUs. But if you are not getting the top NLUs, Nirma University is one of the best private universities out there.
Nirma University promises to give the students better placements than some of the lower-tier NLUs. Nirma University is high on discipline and most of its students dislike this about the university.
What you should remember is that there is not much difference between how much you will pay if you end up studying in an NLU, and how much you will pay if you study at Nirma University in five years.
Nirma University is not as popular in the area of law as the top-tier NLUs even though it is pretty popular if we consider private institutes. If you have the skills and knowledge appropriate for placement, you will be placed at Nirma University. But getting good placements depends a lot on how much effort you put in.
If you work hard, 12 lakhs will definitely be worth it.