Would like to know if anyone can recommend a workbook/simulator that can be used in a home enviroment which

1. Reflects the tasks we will be undertaking as qualified DBAs.
2. Gives us a better understanding/grounding of the theory.
3. Tests what we think we know/can do.
4. Reveals some of Oracles quirkyness or user pitfalls.

I have the Sybex certification set which I find quite good but would like something more practical to ram home the theory as multiple choice Qs certainly don't do this. There is a huge difference between being able to pass the OCP tests and being useful in a real DBA enviroment where you may be surrounded by other IT profs who want answers.

Appreciate any feedback