Hello,

Getting NIT campus depends solely on your score/rank.  if your family income is less than 8 lakh per year then you could have applied for EWS. for now you can't change if you have not given for it.

You can apply for TFW if your rank is eligible for it. TFW means you dont have to pay tution fees but have to pay rest of the fees. you can apply for scholarship provided by institute , state and central government. it will be a financial aid.

Fee structure will vary as per campus. average will be 1.5lakh to 2 lakh per year. for hostel, additional 30k-40k expense will be added every year.

JEE Main Paper-2 College predictor (B.arch)

https://engineering.careers360.com/jee-main-architecture-college-predictor?icn=QnA&ici=qna_answer