I've the novel too but my leading guess is that
Spoiler!
he is wondering why it seems so familiar to him cuz he hasn't taken nor invigilated the exam (he has but doesn't know cuz memory loss for those who haven't read the novel)
Comment by That Gay Cousin on SevenPoker
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@That Gay Cousin
Spoiler!
Huh? I think I might have misunderstood something then because I thought qin jiu and the guy, that ran into the fire whom I don't remember the name of, were separated in this exam. Wasn't the only one left surviving the fat guy and the girl? I might have remember wrong