Hello Janabhi, 

You can easily get admission in NIT, Agartala. Also you must apply for JoSSA counselling to get admission in NIT.

But it's little bit difficult to get CSE branch according to your rank. Maybe you get admission by spot round counselling. But you can get easily admission in ECE branch in NIT Agartala. 

Hello

If you belong to other states except Sikkim then it is not possible for you to get admission over there as the closing rank for general was 19209 and 26490 for CSE and ECE respectively.

But  for home candidates it was as low as 179514 for ECE. For more information: https://engineering.careers360.com/articles/jee-main-cutoff-for-nit-agartala