Hello Neha,

NMAT 2018 exam will be held between October 4, 2018 and December 17, 2018. Cutoff for NMAT 2018 exam will be declared in January/February 2019. NMAT 2018 results are expected to be declared by third week of december 2018. Based on the previous year cutoff, you can have an idea about the expected cutoff for this year.
For NMIMS Mumbai, NMAT cutoff was 200+ and for NMIMS Bangalore and Hyderabad- 180+.
Good Luck!