I scored a 246 in NMAT. 73- QA, 89-VA and 84- LR. Is it a safe score or should I go for a reattempt? (I'm aiming for NMIMS Mumbai)

that is a good score.. cut off might range around 230-240 while sectional might lie around 70. To be very sure you can take a reattempt and try scoring 75+ in QA.