The manga is spending way too much time on this exam if Nino fails. The only thing I feel follows naturally after this chapter would be Nino getting a score better than 240, preventing the Ichika/Miku conflict from ending. But maybe that's just my Miku favoritism coming out, although I could honestly see the story going the Itsuki or Nino route, I don't feel like it's going to go the Ichika or Yotsuba route.
I'm not sure how accurate I'll be, but I did correctly guess the route "The World God Only Knows" was going when I read it so I might have a good sense of this.