This boxed set contains three books covering five exams with more than 2400 pages of DBA certification exam preparation. Overall the set contains over 2000 practice exam questions. At the end of each chapter there are "Two-Minute Drills" which quiz readers' retention of information presented in the chapter. There are also self-tests of exam-based questions complete with in-depth explanations and glossaries of key Oracle terms. The three CD-ROM testing engines that simulate the actual exam environment and hyperlinks questions back to PDF-format electronic chapters of the actual books.