Hii Deepa.
Your percentile is good and your category rank is bit high.
As per the previous year cutoffs and by assuming general category you have a tough chance of getting Medium ranked NITs.
You can get some seats of lower ranked NITs such as NIT Patna, NIT Hamirpur, NIT Durgapur, NITs from North-east,etc and some IIITs such as IIIT Nagpur, IIIT Pune, IIIT kancheepuram,etc.
This is the first time for the EWS category so you will get better than this options as the cutoff may be less for EWS category.
All the best.

You can also check for Colleges on the link below
https://engineering.careers360.com/jee-main-college-predictor

Hii..Yes You are eligible for JEE advance.

JEE advance cutoff for EWS category is 78.8 approx..You got more than That So yes you qualified JEE mains.

Please Register yourself for JEE advance from the official site.

Best of Luck..

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