I am in top 20 percentile cut off this year, am i eligible for nit 2019
As per the eligibility in order to get admission in NITs you should have 75% in Class 12th as a General Category or you should be in top 20 percentile in your class XII exam conducted by the respective board. You can check the further eligibility with the given below link.
https://engineering.careers360.com/articles/jee-main-eligibility-criteria
Good Luck!