I prepared for 3 months with resources suggested by other lucky certificated developers in this forum.
I spent about 2-3 hours a day for books and tests. I took all chapter tests and after finishing the book - took mock exams.
I noticed that people from Wall Of Fame, who scored more then 90%, used Enthuware tests, so I used it too. And yes, they are really much harder then the real exam.
My average score in Enthuware is 85% and my exam score is 97%.
I booked date and time on VUE. You can make payment when booking. I am in Kyiv, so I choose FastLane as my testing center.
No paper is allowed during the exam, but you can use plastic board with markers and eraser.
I had 150 minutes and 70 questions. Finished in 2 hours with two incorrect answers.
I answered all the questions and then review them all. Some are just try to test your attention, so be careful!
Oracle Certified Associate Java SE 8 Programmer I Study Guide: Exam 1Z0-808 by Jeanne Boyarsky, Scott Selikoff
OCA Java SE 8 Programmer I Certification Guide by Mala Gupta