Intelligence isn’t all about smarts.
Without an aptitude to manage time, persevere, prioritize, plan, remember, handle emotions and reflect, learning is a challenge. Intelligence is largely irrelevant.
Worse, most who do struggle with executive functions suffer in school, especially in those with zero-tolerance policies.
All executive functions live in the prefrontal cortex of the brain, the same locale that houses identity and self regulation. During adolescence, this part of the brain grows more quickly and expansively than at any other time in life.