An online conversation reminded me of the following site for CISSP quizes: CCCure.org. If you're working on your cert and are taking the practice questions, avoid taking them at the Pro level. That level does not correlate (at all) to the level of the questions on the actual test. Try jumping back and forth between medium and hard. If you can get a high grade in medium or a moderately good grade in hard, you'll likely pass the actual test.