That's a really good startign point - with 3 to 4 months of prep, you have a shot at breaking the 700 barrier.
First things first: don't start planning to increase your overall accuracy. You're not going to, much - that's not how the test works. Instead, you'll be increasing the difficulty levels of the questions you're capable of answering correctly - but then the test will just give you a harder mix of questions, so you're percentage correct won't change a ton. :)
Log into your student account and read your copy of The GMAT Uncovered (our free e-book). It's already right there in your account. Pay particular attention to the scoring section - once you understand how the scoring works, that will help you to take the test (and study for it) in the optimal way.
Next, use this article to analyze your test results:
http://www.manhattangmat.com/articles/e ... -part1.cfmThat will give you a TON of data to work with - basically, that will tell you what you need to do. :) Because you have our guides, you can also use our syllabus, which you can either find in your student center, depending upon what you bought, or here:
http://www.manhattangmat.com/freegmatlearningforum.cfmUnder the highlights section, click on "Official Manhattan GMAT Course Syllabus [pdf]"
As a general rule, follow the syllabus, but adjust how much time you spend and how in-depth you go based upon your strengths and weaknesses (which you know from that test review that you did up above).
It sounds like you have bought the books but either aren't taking a class or haven't decided yet whether to take a class. If you're still deciding, this article can help:
http://www.beatthegmat.com/mba/2010/06/ ... s-or-tutorIf you already know you want to study on your own, then make use of the forums for help (as you're doing already!). This article can help for that (note: it was written for another set of forums, but it applies to any forums on which you participate):
http://www.beatthegmat.com/mba/2010/05/ ... the-forumsAfter you've analyzed your test, you can come back here to share your thoughts or ask for more specific help on certain areas - just let us know, and we can point you toward additional resources. But if you just got the books, that should be your primary focus to start.
Good luck - let us know how it goes! :)