Despite what you’ve been told over the years, practice does not make perfect.
Practice makes permanent.
Practice entrenches what you are doing through repetition. If you’re practicing perfectly, then, yes, practice makes perfect, but that is rarely the way it goes.
We may practice a lazy swing, or practice procrastinating to the last moment, or practice doing just enough to get the A. In time, that becomes permanent, that becomes who you are.
I offer you (and myself) two powerful reminders:
We are what we repeatedly do.
Excellence therefore is not an act, but a habit.
and, from Archilochus:
We do not rise to the level of our expectations,
We fall to the level of our training.
Practice like you mean it, the way you practice will become who you are.