For the previous year  the cut off for waitlist was 169, with sectional shorts around 96 in Verbal, 144 in Logical, and 120 in QA. A score >210 will give you great chances of getting a waitlist, >215 is certainly taken shots at waitlist.  You have great score, however just the NMAT score isn't sufficient. Confirmation depends on different components which are your Work-ex, Grades in tenth, twelfth and Graduation, CD, and PI. NMAT score weighs just 45% of the all-out score.

Unfortunately, there is no assurance of verifying the admission. Even if you are a topper at there is no guarantee of the call, if you don't perform well in CD and PI.
So, to get the admission prepare for the overall pattern including the CD and PI along with the exam.

Try getting some work experiences somewhere that will give a addition to your good scores.
All the Best.