The minimum qualifying percentile for JEE mains in general category is 50 and for other category is 45. Based on your EWS rank you have pretty good chances for getting into NIT.
some top government colleges you will get till the last rounds of CSAB:

NIT Surathkal- National Institute of Technology- MINNING
National Institute of Technology Rourkela-MINNING, METALLURGICAL, BIOTECH
National Institute of Technology Calicut-CHEM, CIVIL, BIOTECH, MATERIALS
MNIT Jaipur-CHEM, CIVIL, METALLURGICAL
NIT Warangal - METALLURGICAL, BIOTECH
MNNIT Allahabad- PRODUCTION, BIOTECH
For knowing the cut of trends in various nits you can check the article given below https://engineering.careers360.com/articles/jee-main-cutoff-for-top-nits
Use the college predictor link for knowing the college based on your rank or mark or percentile
https://engineering.careers360.com/jee-main-college-predictor?utm_source=qna&utm_medium=jee_cp

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