You have felt uncomfortable with this staff member recently because the person has repeatedly complimented you on your appearance and asks a lot of personal questions including whether you are dating someone.
The student argues about assignments and turns them in late.
On the most recent assignment you told the student their paper would receive fewer points because it was late. They became red in the face and grew increasingly agitated.
Be prepared for each class: this means reading what the students were assigned to read, doing the assignments the students had to prepare, and so on.
Doing this allows you some insight into potential problems that students might experience, as well as an opportunity for developing solutions in advance.
You are worried because you will be handing the assignment back tomorrow and you are unsure how the student will respond.