You can do it!! Looking over your stack, I almost suggested If I Stay or Linger, but then I saw 13 Reasons Why. OMG!!! That is a MUST READ!!!!! Good luck choosing and wrapping it all up :)
I've given up on readathon's too. They're fun, but they kind of stress me out. Still, you read more than I did over my break. I'm not even done with one book yet. Sadly.