Is NMIMS (Mumbai campus)- MBA in core worth pursuing for people having two years of work ex in IT with a pay scale of 6.5+ LPA?

Your question is a very ambiguous one. The answer lies within you as it is you, eventually who knows why exactly you want to pursue an MBA.

I had a friend who did his MBA core from NMIMS and I remember that he also had the same work experience. Once he was done with his two-year MBA core course, he was an entirely different person. 

The following table shows a brief insight on the programs:

The course helped him in his personality and career development. Opting for a better payscale also becomes easier. You can choose which companies you want to work with.