I've never heard of it...interesting.
Don't go crazy trying to figure it out. There are lots of tips in forums like this one. I have most often seen recommendations (and started recommending this myself) to do the following:
1. Get some good review guides and practice tests. My picks were 1) the Princeton Review Cracking the GMAT with CD, 2)
Official Guide, and the official practice tests (GMATPrep for 2006 test-takers). PR has the best verbal prep and their practice tests are closer to the real thing than any outside of the official tests.
2. Start by reviewing the PR book to understand what the test is all about. Don't take a practice test until you've done this, and have done some practice questions. If you take one before you're familiar with the test, you'll probably freak out by your score, unless you're a genius at these tests or recently graduated from college!
3. Do practice questions on weekdays, and a full, timed practice test each weekend. Try to devote at least 2 hours on the weekdays for practice questions, and do questions of the same type on one evening (i.e., all sentence correction). Keep an
error log as you go. By focusing on one question type at a time and tracking your errors, you'll pick up more quickly on weak areas and be able to tackle them better.
4. A prep time of 2-3 months seems to work for many people, with more time needed if you've been out of school for a while or have a hectic schedule, and less time if you're hitting your target scores in practice. Don't schedule your GMAT until you've got a feel for how you're doing and how much time you can really devote to your prep.
5. If you're not getting where you need to be in practice, consider a prep course or a tutor. It can make a huge difference to have a pro guide you.
6. And of course, visit the forums and ask for help when you need it. After all, it's free and often very useful!
Hope this helps. Good luck!