Can I get an IET Lucknow fee waiver sheet after the 1st round of counselling?

Well, it depends on many factors but most importantly on luck.

After 1st round of counseling, you have not been allotted a fee waiver. You are behind a lot of students but those are toppers who hold much better ranks than you. If they have the required rank they may get some better colleges maybe even some NITs.

If they leave or shift and you are just below them, then you can get the fee waiver seats after their vacancy. However, you need to have better rankings from your fellow compatriots as well. Otherwise, the next best candidate will be offered the seat.