Dumps are not allowed by Oracle. Using them (or asking for them -- especially on Oracle's own forum) puts your certification status at risk.
You can find links to significant amounts of legitimate study materials here:
I passed the exam yesterday. I used both
(a) Steven O 'Hearn's book
Steven O 'Hearn's book provides good coverage. The Learning Key tests included are "more difficult" than the SelfTestSoftware practice tests. However, the advantage with the SelfTestSoftware tests is that they tell you why your answers were wrong (the Learning Key tests do not provide this guidance).
Hemant K Chitale