Definitely best to get the most recent input. However, this test already has an implied dated-ness about it. 1Z0-898 is "Java EE 6" specific. For example, the link below:
http://docs.oracle.com/javaee/6/tutorial/doc/
Has a date mentioned within it of 2013.
My conclusion: of course it is best to get recent input. But, it may not make that much difference here. Oracle could change the question set, but I think they have to stick with concepts and
material that were current when
Java EE 6 was released. They cannot suddenly ask Java EE 8 questions.
I hope that helps.