I am in the same boat as you (just started intensive studying now for fall applications), but I have done a fair bit of research on the subject.
I took the GRE two years ago, with not much preparation, hit above the 80th percentile in verbal and essay, but did poorly with math.
I went with magoosh. They have a 6 month study plan that I like because it is structured and keeps you focused...so I agree with the above poster. This is the program I am following:
http://magoosh.com/gre/2012/6-month-gre-study-plan-for-math-beginners/
I like it so far. They have other programs that might fit other people as well, both in length and different specializations (ie, math heavy vs verbal heavy). You have to spend around $300 bucks to get all the required materials, but I feel it is definitely worth it.
Also, for vocab...I am using Anki. Basically I took all the words from Kaplan and Magoosh's flash cards and made my own. I like Anki because it is super efficient and customizeable. Once you get through the arduous (using GRE words in context FTW) task of making them yourself, you can whip through 100 flash cards every day and really nail down your vocab, which I would argue is the single most important component on the verbal section.
