They gave us IQ tests in 5th or 6th grade. It was the early 1970's. The only IQ test I've seen since then was one of those silly "Mensa tests" that get bandied about Facebook all the time. You know the ones: "Nine out of ten people couldn't figure these out! Can you?" Colleges didn't ask for IQ test results. They asked for SAT or Achievement scores. It's a good thing, too. I tanked the IQ tests because I don't do well with timed multiple choice tests. Yet I was reading on a college level in Junior High school. I also tanked my SATs, with around a 1300 combined score. And yet, I scored the top 10% in the school district, and the top 1% in my school, for the English Achievement.
Part of the problem with IQ tests is that they don't measure your intelligence. They measure your ability to correctly answer multiple choice questions in a short period of time. Considering that most of those questions only have 4 or 5 possible answers, you have a 20-25% chance of getting it right, just by taking a wild guess. Guessing based on "what seems like a good answer" will give you almost a 50% chance at guessing correctly. You don't need to know the answer. You only need to be a good guesser, and you need to be able to guess quickly.
The other part of the problem is bias, which someone already mentioned. The wikipedia entry is a good summary explanation of that.
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