If the article linked above does not make this sufficiently clear, I'd stress that everyone should be aware how serious GMAC's non-disclosure provisions are. You risk having your GMAT score cancelled and never being permitted to again take the test if you subscribe to a website offering 'live' or 'real' GMAT questions. This forum is, thankfully, legitimate, as are most on the web, but some are not. Do your research, and if in doubt ask here- you'll get good advice. Do not, under any circumstance, consult documents known as 'JJs', or attempt to learn about questions in the current testing pool- ethical issues aside, you risk jeopardizing your opportunity to ever take a GMAT or pursue an MBA. When you complete your GMAT, do not disclose to anyone the questions you saw on your test.

Great advice, Ian.