I primarily used Manhatten Prep's Strategy Guides. It's a whole set that covers each major topic on the GRE and has both strategies and practice problems. It's a little pricey if you buy them new, but I found used ones and just ignored the scribbles. I also bought Manhatten Prep's 5 pound book of practice problems, but honestly didnt use it much.
My biggest advice is:
-take an initial practice exam to see what your strengths and weaknesses are and make a study schedule around those.
-stick to your study schedule and be disciplined!!
-take practice exams quite regularly
-be sure to practice the writing portion too! It's hard to brainstorm and write an essay in just 30 minutes.
Good luck!! 🙂