I had recently visited the uCertify site. They are offering 70% discount on their oracle exam simulations. But I donít know how long it will continue and is it worth buying those exam simulations. Also I need books, some topics are creating prob, I downloaded questions from ucertify. Good questions and explanatory study notes are helping but for certification exam we should know the whole stuff. The topics covered are Networking Overview, Basic Oracle Net Architecture, Basic Oracle Net Services Client-Side Configuration, Backup and Recovery Overview, Oracle Recovery Manager Overview and Configuration, RMAN Incomplete Recovery. There are much more but I have problem on these above topics. What books should I have to use to clear my doubts on these topics?