I am glad that, i just passed my Oracle11g OCP exam last week. I just wanted to share my preparation with other folks...
Here are the my preparation steps.
1. Read Oracle11g New features Ebook(Download the book here)
2. Read the oracle-base link. Click
3. Went through testking question (Please contact me if you need)
4. Ofcourse, My practical experience helped me to pass this exam.
At the end, i successfully passed 1ZO-050 exam with 99% score.
Hope it helps.