We often confuse having a high IQ with being smart. You can have a very high IQ but still not be smart. As martial artists, we've all set a goal of earning a black belt. When it's time to practice and we choose to skip it, we're not making a smart decision based on our goal.
A smart person makes choices and takes actions that align with their goals in life. They take responsibility for achieving those goals. On the other hand, someone who is not smart makes poor choices and takes actions that prevent them from reaching their goals.
Since you are in class today, you can count yourself as being pretty smart.