And memorize a few quotes related to each one of these topics, as they will be handy.
This would downplay your own voice and leaves little room for your own ideas.
It is your essay and it should be your voice that needs to be heard, not some notable/famous person’s. So, don’t cram every quote you know into the essay.
This may sound crazy because giving out the questions in advance is not normal. You can find all the GRE essay topics on the official ETS website. Also, practicing each of these topics is not advisable as it is going to take a lot of time and effort and there is no point in mugging them up.
You could as well spend this time on learning some math. Just scanning through these two lists will give you an excellent idea of the types of issues and arguments that show up on test day. Most of the topics that show up on the GRE essay section can be broadly grouped into five categories.