What are some good books? *For teenagers*?

I suggest The Study series or Gl series by Maria.V.Snyder. she is an awesome writer and i read the study series and am about to read the gl series. Read the study series first, it's about a girl called yelena who killed this bloke and she becomes the commanders food taster, where she falls in love with valek, the in. it's got magic, romance, betrayal and action. she also learns that she isn't really an orphan and it's really good.