The Hunger Games is a really good book by Suzanne Collins. It is about a girl named Katniss who volunteers for her sister to participate in the Hunger Games, a game where children are forced to fight to the death in an arena created by the Capitol. This book is a great example of how the government takes over in some societies.
The City of Glass is one of the books in one of my favorite serieses, The Mortal Instruments. It is about a couple of teenagers who must battle demons from other worlds in an effort to stop a villan, Valentine.