I am piano grade eight. When I was learning the piano, I learned four books at the same time. A fingering, a speed, a tune and a knowledge of music theory. If you have time and conditions, practice every day, one class a week, and practice for half an hour to fifty minutes every day. This is very stressful for high school students. I suggest you pause in your senior year. In two years, you have basically mastered fingering and the coordination of your right and left hands. Jean can't be in a hurry, please think about it.