I passed the other day as well, and yes, it was very difficult and a lot of the content seemed completely unfamiliar . Here are the categories :

Java in the Database
Optimizer and Query
Summary Management
Indexes and Index-Organized Tables
Object Relational Features and LOBS
Partitioning Improvements
Oracle Universal Installer : Migration and Upgrade
Tablespace Management
Database Resource Manager
Manageability Enhancements
Availability and Recoverability Enhancements
Features of NET8
SQL*Plus, Pl/SQL, and National Language Support Enhancements
Database Security

The topics I most struggled with were NET8 (some networking stuff I had no idea about ), Partitioning Improvements (indexes, I think ) and Availability and Recoverability Enhancements.

J.