Because their Professor Williams designed exams with great care, yet most students could always manage to pass. Hardly anyone ever failed in Professor Williams' class...
If a student scored just over fifty, Tiana would let them pass directly.
Professor Williams often said that their job in education wasn't to catch students who failed but to ensure they grasped the knowledge points, and that would be sufficient...
However, after every exam, regardless of whether she would continue teaching them in the following semester, Professor Williams would still ask a few students to visit her office.
Those students were the ones who were hanging by a thread on the exams.
"If you review seriously, it will naturally not be difficult," she said.
"Understood..."