Intelligence is measured by taking a professional IQ test such as the Standford-Binet. MENSA has a Home IQ Test that can be taken in your home as the name implies. However, there is a testing fee of...
IQ tests
An IQ Test is a test that measures intelligence. (see related question below)
No, it's a measure of diligence or daddy's wallet. Football players "graduate" all the time and half of them have suffered some sort of brain trauma.