I certainly studied for a major IQ test, over the course of a week. Basically, I went online and did every free IQ test I could find. You start to learn the various tricks and patterns they search for, and my overall range of scores increased over time (though there was wild variance from test to test).

Ostensibly, given all the nebulous argumentation of what "intelligence" is, the only thing an individual IQ test concretely measures is how good you are at taking IQ tests. ;-)