Always study with the most up-to-date prep! Look for GRE Prep Plus 2020 , ISBN 978-1-5062-4892-9, on sale June 4, 2019.
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Good prep book, particularly when paired with the online course and the vocabulary phone app. Online course has two full practice exams, one to take before tackling the book, the second about halfway through. The book definitely improved my score. I poured over it for two months and just found out that the GRE requirement for my program was waved (for all high GPA). Oh, joy and gladness!!! Still, the book definitely enlightened me. It has some mistakes, as does the online course, like some test answers, or the order of the answers, which can be confusing if you get stuck on it, so move on. For the vocab part, phone app for Kaplan 500 words was very helpful as well. Just flashing the words a couple of times a day did the trick.
The only GRE prep I used, and I came out with a decent score. Just work through all the problems and do the writing assignments and you'll be golden. You'll never memorize half the words but give it a decent shot.