I passed exam (58 correct answer per 60 questios) using only this book for preparation. The good things that it's relatively short and information is given in condensed form. If you have some practical background and know general terms (and you should know it as 7.3 DBA!) you don't need to waste your time on basics. The bad thing that it has many minor mistakes. It's not crucial for a test, but a bit annoying.
I am hooked on the exam cram series. This book gives harder questions then the Oracle Press books. This makes you think more about the material, which in turn makes you better prepared. I felt that using this book gave me a well rounded knowledge of the Oracle material, and the Oracle Reference books helped me in fine tuning those areas I needed help in. With the help of this book I passed the OCP Oracle 8 Upgrade Exam! Study Time was 1 month.
Although I recommend this book for the upgrade exam, there are a few precautions. I discovered via the self tests that the discussion on partitioned indexes was pretty inadequate (read the Oracle Concepts guide). If you don't use the networking stuff, you will need supplementary reading too. There are some aggrevating problems with typos/edits (like object views), but most of the material is otherwise strong.
This is an excellent book from the point of view of coverage ,language and questions included. There are a few minor mistakes but one can make out that those are editing problems and hardly those will misguide anyone. I went thru Oracle manual for concerned chapters once and went thru this book twice. Today, I cleared my exam with a score of 58 out of 60. Need I say more!
Excellent resource for preparing for the exam. Using this book as my main study guide and supplementing with other sources on the "hot" topics (partitioning, objects, RMAN, etc.), I was able to pass the test the first attempt. I will definitely be purchasing the upgrade to 8i book once it becomes available.