This looks along the lines of "Sweet Valley High" and might be suitable for 13-15 year olds, but I thought I'd put it up here anyway. I just typed in "sorority" for books on Amazon.com and presto! I got some hits!
"You have to STAY COOL in order to get into the hottest house on campus"....PUH-LEEZE!
I think a lot of NPC and NIC related books deal more with heavier topics such as Binge Drinking, Hazing, Date Rape, and Sexuality Issues:
Fraternity Gang Rape : Sex, Brotherhood, and Privilege on Campus by Peggy Reeves Sanday
Wrongs of Passage: Fraternities, Sororities, Hazing, and Binge Drinking by Hank Nuwer
Out on Fraternity Row : Personal Accounts of Being Gay in a College Fraternity by Shane L. Windmeyer
Secret Sisters: Stories of Being Lesbian and Bisexual in a College Sorority by Shane L. Windmeyer
or, they're books along the "Guide to College" lines and all about PARTY PARTY PARTY.
Apparently this book is a non-fiction account of Alpha Phi:
A Goodly Heritage: The Collected Works of Betty Mullins Jones
by Betty Mullins Jones
This one looked kind of interesting:
Sister Secrets by Breggie James