I assume you are referring to: *1Z0-554 Oracle Application Development Framework 11g Certified Implementation Specialist*
Oracle has many certifications. Supplying the exam number when asking a question is the best way to ensure you get relevant answers.
Where can i get the some sample papers?
The only recommended sources of practice tests are Transcender and Self Test Software. Neither has anything for this exam nor is likely to. They tend to create tests only for the most commonly taken exams, which this isn't and likely never will be.
Ucertify has a larger number of exams available, but not this one. From the notes on that exam, it looks like it recently came out of beta, so I would not expect a self test to be created on it 'soon' by anyone.