Go Ask Alice by Anonymous.
Most gripping young adult novel you've read?
This is an excellent book and the movie was good also !
The Mortal Instruments.....by Cassandra Clare
Great series for young adults.
Throne of Glass series by Sarah J. Maas. :3
I agree with Mia! Throne of Glass books are really good, however as usual you can definitely tell they are more geared towards teens.