How is NEIGRIHMS, Shillong for MBBS if I want to pursue my residency in the US?

I would advise you to not opt for NEIGRIHMS if you plan to pursue your residency in the US. It is better to look for other colleges if you are seeking admission through NEET. You can join a USMLE coaching during your MBBS degree itself. At some other college, you’ll be exposed to students who have cleared their USMLE. Almost negligible MBBS students from NEIGRIHMS apply for/ clear USMLE. The college is in a budding state, so the faculty isn’t sufficient. However, the teachers are helpful and supportive. 

NEIGRIHMS is not a very good option in your case.