"Okay, okay, okay, we really need to study hard too. We can't just have one student placing first and then the rest plummet in their scores. We've got to earn some respect for the school. After all, we've improved by nearly a hundred points this time."
Even if the exams were easy, it wouldn't be possible for the scores to increase this much. Obviously, they had improved significantly.
This month's exam saw improvements for all students in class 9. Not one of them scored lower than last time, but it was different for the other classes. Even though the test was not very difficult, there were still students who performed worse than the baseline test at the beginning of the semester.