Some IQ quizzes I've taken online don't even provide instructions for each section. You might see one "solved" example and then have to figure out the rule for the actual IQ test questions. I've been told that a real IQ test is much more involved than any online "IQ test".
Some of the questions I remember from an actual IQ test I took at school had to do with logic. They were questions like "All snorks are fleegles. Some fleegles are gleeps. Bill is a fleegle. Is he also a snork?" You have to draw a Venn diagram, at least in your mind, to determine if Bill can be in the fleegle circle but not in the snork circle. There were a lot of questions like that on the IQ test.