I'd Tell You I Love You, but Then I'd Have to Kill You by Ally Carter (2006, Reinforced Hardcover)

Cammie Morgan is a second generation Gallagher Girl who looks like any other teen except she is in advanced martial arts and does extra credit for breaking CIA codes in computer class. The Gallagher Academy is really a spy academy for exceptional young women. Cammie is all that with her knowledge of 14 languages and she is only a sophomore. Sophomore year is also field work year and the students begin Covert Operations. She is out one night and meets a boy who she falls for! Josh is an ordinary boy, unfortunately, and Cammie is no ordinary girl. She can't tell Josh who she really is. She plans to 'accidentally' bump into him as much as possible. The final exams include being kidnapped and getting free. Cammie has made herself to look like a normal girl, about to date a normal guy.

Very cleverly written with lots of wit and charm. CoveOps assignments with a cast of teen characters that make it funny and unforgettable. I highly recommend this to any teenager girl.