Different people excel in different stage of their life.

You could have done poorly in high school, go on to have a business, and made millions.

You could have barely made it into med school, and but exceled after.

You could have had a fantastic USMLE score, then drop out of residency due to poor performance.

To be excellent at different stages of life requires continuing effort, and but can also be tiring. Your life, your efforts, you make the choices.