I'm guessing it's this book your working through
Cohen-Tannoudji, Claude. Quantum Mechanics. 2 vols. Wiley, 1977. ISBN: 0471164321
(reading for http://ocw.mit.edu/OcwWeb/Physics/8-05Fall-2004/CourseHome/)
I know very little about QM but googling I found this set of problems and solutions, I...