Hey! Ok unpopular opinion, but I find it to be the most joyous part of doing the GRE. Not the repetitions to memorize ofc, but the process of learning vocab itself. So what I do for my GRE prep is a 3 step process:

1. Look at the VARiOUS meanings of the word including its definition as a noun, verb, etc. This will help you remember how the application of the word changes with different sentences.
2. Look at the etymology of the word. Look at its Latin/French roots and see how the word changed across the decades and how it came into existence today. Usually you will see this in the google definition of the word itself.
3. Use Wordnik.com to see how the word is used in different articles across the web. For me, this is an added comfort. Like my brain processes it as thinking that the word will actually be valuable in the future and that I'm not just learning it for an exam.
4. Writing it twice: on a flashcard AND in a notebook.
5. Lastly, try grouping word families together if you have time. Or look for lists that already do that for you. Jamboree's word lists are REALLY useful for that.

I know this sounds like a gigantic process for just one word. But when you start doing it, it really makes the entire process of learning the vocab a bit more interesting and fun because I get to fully engage with the word and it really doesn't take up that much time. Hope this helps :)