The cutoff varies year to year & also Home state/ Other state quota. Last year to get admission in NIT Agartala the cutoff Opening rank was 2982 & closing rank was 6135. The score you can expect around  more than 180. You can check the further detail with the given below link.

https://engineering.careers360.com/articles/jee-main-cutoff-for-nit-agartala

Good Luck!