The money you have to come up with on your first bill is what the university bills you for tuition, fees and room and board per semester. They subtract half of your yearly scholarship, grants, loans from the direct billed costs.
That is the amount due on your bill. Did you get your first bill?
The other costs that sometimes get included in a school’s COA like books, travel, personal expenses can be somewhat controlled by you. Books can be rented, bought used sometimes.
If you have enough savings you could pay for your first semester bill and your books and you said you already have your ticket for getting there. Insurance sounds like it’s taken care of as well.
You would need that work study job to earn up to $1,500 a semester, which should cover your expenses, books for second semester and flight home.
Then you need to make sure to line up a paid summer job or internship (the engineering dept should help line up) to have money for next year.