Become familiar with this map: the AP board expects you to know where all of these regions are!
And here's a great website to use when studying many of the empires we discussed and where they were located. It's made by a couple of Harvard students so you know it's good.
There are several different maps on the pdf here. Also each unit will have a map of the major civilizations/empires from that time period. Make sure that you know the general area or region where they exist(ed).