This  might be anecdotal, but I'm a relatively smart person with good reasoning skills. But I also have severe evaluation aversion. Even if I know something really well or have done an activity hundreds of times, I'm prone to messing up if I know people are watching. If I were to take an IQ test, I would probably do poorly because I would be worrying too much to think clearly. Could anxiety during an IQ test cause you to have a significantly lower score that doesn't accurately reflect your actual intelligence?