I would recommend How to Win Friends and Influence People. I think it strongly qualifies under the "practical application in college life/job seeking being a good adult" criterion.
But I also strongly heartily second /u/gwillen's comment: having some "real life" under one's belt would be extremely helpful.
My sister (and about 2.5 million other people) are headed to college in the fall.
I gave her a copy of Cal Newport's How to Win at College as a graduation gift, but given that her life is about to change more than it has in any of the past 14 years, one book probably isn't enough.
What books do you think incoming/recently arrived college students should be reading? You can assign reading with any motivation you'd like, but I'm looking especially hard for books that meet the following criteria: