could someone pls tell if a scaled score of 217 enough for nmims bangalore or should i give retest

Bangalore is the second preference for most people after Mumbai, and people are expecting Mumbai to have cut-off between 230-240. For last few years, Bangalore has a cut-off of 10-15 marks less than Mumbai. So, if 230 will be the final cut-off for Mumbai, you will be a boundary case.
If you are confident of increasing your score by at least 10-15 marks, then give a retest, if not, just hope for the best.