Like you I've never seen the point in doing endless questions. The aim is to understand Oracle, not learn a few answers parrot-fashion.

If you've read my revision notes and the PDF by Howard Rogers you should be most of the way:

http://www.oracle-base.com/Misc/OCPCertification9i.asp

I would advise doing a few questions, even if they are old 8i ones just to get back into the swing of doing the exam.

Remember, these are lots of "3 out of 5" and "4 out of 6" style answers so you may know most of the stuff but still fail th question. The more reading you do the more likely you'll pick up the extra details.

Good luck