Hello Aspirant,

According to your score 81 percentile in JEE mains, your general category rank will be somewhere between 2,00 000 .

getting a seat will depend on varies factors such as number of students applied for the same branch, performance of the students, category of the students, home state etc.

Go through this link to get detailed information about total number of seats NITs :

https://engineering.careers360.com/articles/nit-seat-matrix

Use the below link to get list of colleges that you can get based on your rank :

https://engineering.careers360.com/jee-main-college-predictor?utm_source=qna&utm_medium=jee_cp

check out the previous year's cutoff for NITs:

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

You can also check out marks vs rank vs percentile from the below link:

https://engineering.careers360.com/articles/jee-main-marks-vs-percentile

Hope this information helps you.

Best Wishes!