ManalSh

Which edition of the Barron's book did u study from? should I study from the latest one-probably the 20th edition now-?

So I'm going to take my GRE test Jan 7th. It's going to be my first time taking it and hopefully the last. I've been browsing through many websites to find out what is the best book to study from, and I concluded either Kaplan or Barron's. But what I can't figure out is, which is the best vocab list to study?? I found dozens of lists online and I ave no idea which one to memorize. Plus do I have to memorize the definition PLUS the synonyms?? Any help will be appreciated. Thanks :)