These articles give some interesting recommendations on books for teens, especially for boys.

http://www.telegraph.co.uk/culture/books/bookreviews/8623402/Column-Sarah-Crompton-on-how-to-make-boys-read.html

Teen fiction - adventure: http://www.telegraph.co.uk/culture/books/bookreviews/8623091/Teen-Fiction-Adventure.html

Teen fiction - historical: http://www.telegraph.co.uk/culture/books/bookreviews/8623128/Teen-Fiction-Historical.html

Teen fiction - fantasy: http://www.telegraph.co.uk/culture/books/bookreviews/8623159/Teen-Fiction-Fantasy.html