I improved my score by 9 points which may not seem like a lot (ended up with a 153V/155Q), but I had only two months between each try. I think if you have more, then you can probably improve more! I just cranked out a bunch of practice tests, there isn't really anything to study or learn, just lots of practice. Like the person above, I didn't find any point in memorizing hundreds of words and their synonyms, but focused more on the sentence completion and reading comprehension parts. For the part, just try not to trick yourself into thinking you have all the math concepts down! It can be deceiving (i did really well on the practice math sections, but the real test was more critical thinking/problem solving and less algebra).