It's tough to get back into the "study" mindset after so long! But you can definitely do it - it's just going to take some work.
Just one thing first: do you really think you
need a 760, or is that just your goal but you'd be happier with something lower? I ask because a 760 is the 99th percentile, and there's no school on the planet that requires that kind of score. Even for the most competitive programs, if you break 700, you'll be fine (as far as the GMAT portion of your application, anyway). In addition, if you're looking at an executive MBA program (which is more common for those who have been out of school for a long time), the scores there tend to be a little bit lower.
That doesn't mean you shouldn't try for such a goal, but you should think about whether something like that is really worth the effort. Presumably, you have other things going on in your life besides the GMAT. :)
So, you're going to need a plan. You'll have to start by deciding how you want to study - on your own? with friends? with a class? with a tutor? If you want to work on your own or with friends, start by looking at
www.BeatTheGMAT.com. This is a forum and blog for GMAT students; the owners of BTG are totally neutral and they've made deals with a bunch of test prep companies to answer questions and write articles for the blog. There are tons of students studying there, so you can get ideas about what resources you should use to study and how you should set up your study plan.
You're going to need:
1) Books that teach you the material (grammar, math) and techniques (for the different question types). This kind of stuff comes from test prep companies; ask around, browse in a book store, and find stuff that you think will work for you.
2) Practice questions. Here, you want the Official Guide materials - these are problems that used to be on the real test, but they've been retired and published by the test writers so that we can all study. The latest three books are The Official Guide 12th Edition, the Quantitative Review 2nd Edition, and the Verbal Review 2nd Edition.
3) Practice tests. You can get two free GMATPrep practice tests from the maker of the real test - go to
www.mba.com. You can also get more practice tests from the test prep companies - again, ask around to see whose tests people like (our tests are very well reviewed... but check around for yourself!)
You can download our course syllabus at the below link. If you decide to use some or all of our books, you can follow this syllabus.
http://www.manhattangmat.com/freegmatlearningforum.cfmUnder the Highlights section, click on "Official Manhattan GMAT Course Syllabus [pdf]"
If you want to take a course or work with a tutor, shop around. Most companies have free events or classes you can attend, so take advantage, ask questions, and try to find the best program for you. In particular, you want to make sure that you feel as though you can really learn from the teacher / tutor - that his or her teaching style works for your learning style.
Good luck - let us know how it goes!