You might like the "Gone" series by Michael Grant -
"The series is centered around the fictional Californian town of Perdido Beach. Every human 15 and older vanishes, and the town and surrounding areas (later named the FAYZ) are encased within an impenetrable bubble. Many of the people and wildlife develop supernatural powers." (from the Wikipedia page)
Or "Vampire Academy" by Richelle Mead.
"It tells the story of Rose Hathaway, a seventeen-year-old Dhampir girl, who is training to be a bodyguard for her Moroi best friend, Vasilisa "Lissa" Dragomir. In the process of learning how to defeat Strigoi (the evil undead vampires) in St. Vladimir's Academy, Rose finds herself caught in a forbidden romance with her instructor, Dimitri Belikov, while having an unbreakable bond with Lissa." (from wiki)
If you liked the premise of "The Hunger Games", you could try "Battle Royale" by Koushun Takami, or "The Long Walk" by Richard Bachman/Steven King - they've got the same theme of young people in a deadly competition.