Hello,

Below is the link which has the cuttoffs in NIT's of previous years for chemical engineering

https://engineering.careers360.com/articles/nits-cutoff-for-btech-chemical-engineering

And since your score is 81.34 NTAit is also your percentile ,now basis of your percentile your rank would be around 190892-214590.

Now based on your rank you can check the NIT's you might have a chance to get into,for predicting the colleges based on your rank go through the below link

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