You're not eligible for 100% fee remission at NIT because your EWS certificate shows 3–4 lakh income (limit is 1 lakh). Since your brother (unmarried) is on the same family ID, his income is counted .

1. Try getting a new EWS certificate showing only parents’ income

2. Visit Tehsildar office to explain your case.

3. You can still get 2/3 fee waiver (for income < 5 lakh).

Check NIT Fee Waiver Rules – Careers360