Hey Sulender,

It depends on the NITs. Like In most of the NITs when you see your income certificate you will get fee remission at the admission time without any verification because they trust you,

But in NIT jamshedpur 1st you have to pay all the fee then you have to submit income certificate , pan card , adhaar card and fill a form after 5 to 6 month you will get your money back (remission money only )

Good luck!