GRE Studying Materials

[EASTCOMPTON]

Hey all,

Brief question here. 

I took the GRE 6 years ago, and I am now applying to some Phd programs for which I have to retake the exam as my scores are out of date. Back then I bought I bunch of books and study materials from all of the publishers (Princeton, Kaplan, ETS, and else). I was wondering if these materials (specially for the Vocab stuff in the language section) is still up to date, and is reliable to study for the test in 2019?

Im mostly worried about all of the flashcards I made or bought (Kaplan) back then. Would these still work for the 2019 test?

I appreciate all the help!