It depends, I guess.
This book primarily deals with practical issues while the exam is focused on the spec. But as Kathy has said, the creation of the exam is influnenced by the concepts brought forward in this book. If you are new to J2ME, I would definitely recommand you to get a introductory book to go with this one.
BTW, Thanks Ko Ko.
[ January 20, 2004: Message edited by: Michael Yuan ]