Your class 12th scores are great though they require only 50%. But you must score at least 110-120 in CLAT in order to get into NMIMS. With your score you'll get a rank somewhere between 3000-4000. But the rank you're required to have for admission in NMIMS is around 2500. But you've a pretty decent score and you can definitely check out some other good private colleges like ICFAI Dehradun or UPES Dehradun. 

All the best