Back in the dark ages when I was a student, I was heavily involved in music plus a lot of other extracurricular activities. One day it just came where I realize that I needed to choose when I wanted to focus on— so I dropped tons of commitments to focus on the piano as well as give myself a chance to breathe. Looking back, I have no regrets about my decision.
I need to warn you that adult life can continue to be equally busy— between a career that often consumes more than eight hours, family, chores around the house. You need to develop good practice habits — not just in your teen years but also an adult—because time is always limited.
What I do, which works for me:
-I do not allow myself to start at the beginning of a score every time I practice.
- I mark the problems, whether it be a phrase, a measure, of even a handful of notes, with a transparent post-it flag (transparent so you can always see the notes). I work on the ‘flagged’ parts until they are no longer problems and I can remove the flags.
If I make repetitive errors, such as a wrong base note, I highlight it with an erasable yellow highlighter.
Whatever you do, you need to focus on the areas that need work— rather than habitually playing the areas that you play well (and yes, it does make you feel sooo good to play the easy parts).
On the problem sections, think creatively of how best to practice them— it might be irregular rhythms, playing a few notes, analyzing fingering etc.
Don’t practice longer than you can stay really focused.