HI. If this 18300 rank is your EWS category rank that no need to worry because not only you can get into NIT on this rank but also you may have a free hand on choosing your favourable branch into many of the NIT institutions. For your easy convenience I'm mentioning the JEE mains college predictor link below where or with the help of which you can easily get to know all details about all Institutions and there all details as well.

JEE Mains college predictor link;

https://engineering. careers360.com/jee-main- college-predictor?icn=QnA&ici= qna_answer

Good Luck.