<p>The GRE general test can be taken any time of the year, at any of the registered testing centers. Can only take one gre per calender month, with a limit of 6 times per year I think? Not entirely sure about that, you can find the info on their website; just go to google and search. The important thing is if you are going to take the subject test, it is only offered 2-3 times per year, once in the spring and 2 times in the fall I believe. The general GRE consists of an English and math section as well as an evaluation of an argument essay and another essay. Start planning for the GRE tests (registration, etc.) midway through your junior year, but you should be studying off and on for them, especially if you are not good with the vocab.</p>