Mock Exams

Caution

• The quality of mock exams can vary greatly. You shouldn't settle for anything found randomly through googling. Check that the exam is for Java 8, rather than Java 7 and below.

Enthuware

Enthuware are best regarded by the JavaRanch community. They are very reasonably priced. The latest as of writing:

• JA+ V8 for Oracle Certified Associate - Java SE8 Programmer I

Review What is the best way to prepare using Enthuware tests? and How to really study with the mock tests?

Others

You could also explore:

• http://www.whizlabs.com/oracle-java-certifications/
• http://www.gocertify.com/quizzes/oracle/
• http://www.myexamcloud.com/onlineexam/examlist.html
• http://www.examlab.org/ - claims to be free, but then asks for money. Shouldn't have a .org hostname

Free sample exams

Check out http://javarevisited.blogspot.com.au/2015/11/5-free-ocajp8-ocpjp8-mock-exams-and-practice-questions.html