Today I passed the certification test!
Just want to share my experience for people who are approaching to the exam right now.
I'm 35 year old, I started studying Java on official Java Tutorials in January (never ever coded before), then bought the OCP Study Guide at the end of June and the Enthuwere Tests about a week ago. Completely self taught, working in the meanwhile.
I got 76%, that was my average score on simulations. Found the test on the same level of the practice tests, but less time consuming (less code and less options), so that I had about 20 minutes to review marked questions.
Finally: I booked the exam on Pearson Vue website, saving 20€, compared to the price on oracle's site.
A big thanks to all who supported me in the last weeks, you saved me from some really big headaches, especially to Jeanne and Paul.