The company who gave me the test offered me the job after a very brief interview, in which they said the test was not important. It was very clear from their behaviour that they thought it really, really was (important) and they were about to hire some sort of genius. I ran. I'm still running.
In my current position, at Big Financial Corp, I had to take an "aptitude test". There were three parts of it: literacy, numeracy, logic in that order. I suck at arithmetic so after the literacy bit I wanted to get straight to the cool and fun logic puzzles at the end, but the time we were given was like a third of the time the test was meant to take (allegedly, they wanted to see how well we perform under pressure) and I wouldn't have the time to do all three parts equally well. So I thought, screw it, I'll approximate. I clicked through the numeracy test mostly at random (I concentrated clicks on the first three options), hoping to get a 50/50 score and dove right into the logic test at the end. I had great fun and I got hired after all so it can't have been that bad. They haven't told me how well I did because they don't like to um, foster antagonism. Or something.
Point being: IQ tests are stupid. You don't need to have a high enough IQ to pass them. You just need to be smart enough to beat the test. So, useless.