S01E08 story of the last sub-episode - Miyuki (Shirogane) apparently loses according to the narrator. Miyuki is hardly in the story though. Why does Miyuki lose? I guess it's because Kaguya might've been higher in exam results if not for tutoring Yu (Ishigami) ?
It is precisely because he did not appear much.
Based on the manga version, the story ends with Shirogane's narration that he did not play a role in training Ishigami. As Kaicho and a male senpai, he was sort of supposed to take the lead in helping Ishigami, but the role was taken by Kaguya. That seems to be why it is Shirogane's loss.