As a bright student who was never challenged in K-12, I can unequivocally state that this ultimately hurt me in the long run. I seriously didn't know how to study and didn't care to try learning when I actually needed it in some of my undergrad courses.

For example, when I took trigonometry in high school I did none of the homework, showed up to the tests and aced them. That led me to getting a C in that class (kindly the teacher advanced me to pre-calc, but forced me to retake trig as well). That's basically the attitude I had throughout high school and undergrad. I'm positive I could have amounted to more earlier in life (only years later did I return to academia to earn my PhD in CS after tiring of industry).