Hi,
You can download free practice questions from [url]http://www.education.oracle.com[/url] and it contains 40 questions for
each papers.

I agree with tamilselvan, Exam cram is good source
to pass the exam :)

STS, you can buy if you know somebody who also
preparing for OCP so you can share cost of it with him.

HTH,

Good Luck:)