Depending on your major, the math portion should be fairly simple. It’s nothing crazy like differential equations or anything, but there are some ‘tricky’ questions, so it might pay to research some old GREs (should be able to find some free online, the books in bookstores are overpriced!) to catch those ‘tricky’ questions, because they generally follow a couple patterns.

The stumbling block for a LOT of people is the verbal section. Best thing for this is, again, go over SAT and GRE verbal portions, and really brush up on your vocabulary. Working on vocabulary (reading more advanced literature, or just looking up words you don’t know as you come across them in other SAT/GRE practice tests) will help you a great deal.

It’s said (and seems to be true) that your SAT score will be reflected in your GRE score. Mine was a little worse, because I slacked off and didn’t study at all! But I still found it a lot easier than I expected.