By the way you can't be easy to score of 100 marks in JEE Mains. To get seat in NIT Agartala and NIT Meghalaya you have get the rank of below given :

B.Tech. in Civil Engineering - NIT Agartala

Round  1 - 9641

Round  2 - 10830

Round  3 - 11477

Round  4 - 11508

Round  5 - 11627

Round 6 - 13264

Round 7 - 19604

Round 8 - 55541

mostly you have to get it under 10 - 18 k rank to get in NIT Agartala.

B.Tech. in Civil Engineering - NIT Silchar

Round  1 - 8657

Round  2 - 10049

Round  3 - 10108

Round  4 - 10108

Round  5 - 10387

Round 6 - 11840

Round 7 - 45517

For more details for more information follow the below link :

Based on  your percentile, Your Predicted All India Rank is 224000.

You will not get NIT with this rank

As per your rank and previous year cutoff, the colleges you get are:-

IIIT Pune

KIIT College of engineering, Haryana

Pune institute of computer technology

To know more about your chances of getting other colleges check out the college predictor link below:

https://engineering.careers360.com/jee-main-college-predictor