I don't wish to simply bash Mr. Ault's book, but this certification "aid" is by far the most poorly organized and least thought out book I have ever come across. There is no clear breakdown of review material for the PL/SQL and DBA tests. The topics covered regarding PL/SQL are not explained other than a definition and parameter listing that one could easily find verbatim on the Oracle Documentation Library CD. The sample test enclosed covering PL/SQL is not at all like the sample test downloadable from the Oracle website. (One has to believe that Oracle has a better idea of what the test is like than Mr. Ault). I urge you not to waste your money as I did, this book will be off no use in your preparation. The Oracle Press Exam Guide will prove much more useful.