Hello Student, 81 percentile is a good score with EWS certificate. But since the competition is increasing by the day, it is also advisable to look at other colleges as well. You have chances of getting into NIT. But the course is not guaranteed due to the high level of competition for NITs. The cutoff for EWS is 70 percentile. So I would say that you have a good chance. But for preferred courses, it is advisable to apply for other colleges as well