My first reaction was - "Great! Now I have less uncertainty to worry about."
My second thought was - "There are a LOT of topics here."
(My third thought was - "Why didn't we have this in high school???" In Malaysia, I took the SPM, which is roughly the SAT. Having a pool of topics to look would have been very helpful, needless to say.)
In fact, there are 150 issue essay prompts on the ETS website.
You can choose to scan some of these topics, pick out the ones you might have trouble with and brainstorm some potential points to save you time on test day. Or, you can read some sample essays for each of these topics on TestPrepPractice.net. Not only are there sample issue essays, but there are also sample argument essays.
Of course, this is no substitute for actually practicing writing essays. But it will help you, especially if you have trouble generating ideas and points under pressure. Take note that the sample essays are not necessarily perfect "6" essays, and that the wording of the topics may change on the actual GRE.
Happy studying! And remember to share this post if you found it helpful. ;)