@Kaarme It's an anime world. High school kids spend the entire day on fun club activities or works and still somehow manage to pass college entrance exams. Of course, in reality, students study their asses off throughout high school years to pass once-in-a-lifetime exam that determines your future college and education level.
@HungryIm Yeah, that's what I thought as well. I understand for the sake of the manga story the truth can be stretched, but this is quite unbelievably stretched.