I have passed my Oracle Certification Exam 1Z0-808 (Java SE8 Programmer I) this week with a 90% score. Since I took tips from this forum when preparing for exam, I would like to share my experience in case it would help anyone.
1. OCA: Oracle Certified Associate Java SE8 Programmer I by Jeanne Boyarsky and Scott Selikoff.
2. Enthuware tests for OCA-JP-I-SE8
3. Testing code in java ide.
4. Oracle Study