The term self-concept is a general term used to refer to how someone thinks about or perceives themselves. It is an important term for both Social Psychology and Humanism.
IQ stands for Intelligence Quotient. It is a score that combines the mental age of a person with his chronological age. For testing purposes, the mental age is determined by a series of standardized test questions, known as the IQ test. It is estimated that well-known scientist Albert Einstein had an IQ of 160 or more.
The average IQ for anyone is 100. It forms a bell-shaped curve. Stand deviation is 70-130 I think, but don't quote me on that. IQs are adjusted for age. There is no such thing as a perfect IQ test. But lets pretend there is one.