* Men. On average, men tend to overestimate their IQ by about 5 points, while women tend to underestimate theirs by about 3 points. This may be due to a number of factors, including social stereotypes and the fact that men are more likely to take risks and engage in activities that require intelligence, such as taking college entrance exams or applying for jobs that require high IQs.

* People who are successful. People who are successful in their careers or other endeavors may tend to overestimate their IQ because they believe that their success is due to their intelligence. However, there are many other factors that can contribute to success, such as hard work, determination, and luck.

* People who are confident. People who are confident in their abilities may tend to overestimate their IQ because they believe that they are smarter than others. However, overconfidence can lead to mistakes and poor decision-making.

* People who have a high need for achievement. People who have a high need for achievement may tend to overestimate their IQ because they want to be seen as smart and successful. However, this need for achievement can also lead to stress and anxiety.

It is important to note that not all people in these groups will overestimate their IQ. There are many factors that can influence a person's perception of their own intelligence.