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in this discussion.
Intelligence quotient is a good measure of some kinds of academic intelligence. However, it does not measure things like intuition, emotional intelligence, social intelligence, and other things that are also part of someone's makeup and contribute markedly to how well they succeed in school and elsewhere.
Some people are very intelligent in everyday ways, but are not book smart. I know someone who can wire up a power plant, but failed to pass the ninth grade. So, you don't have to have a high IQ to be smart.