I agree with Ken. Getting a solid education should be your top priority. As far as the game itself I would say it depends on what your goals are and where basketball ranks in your life. At your age I knew it meant everything to me, I would, as they "eat, sleep, and dream it", and I can only imagine that your passion for the game is that high as well. Endurance in sports matters. Start to do some jogging to help build your endurance.
What's also important to build are good leadership skills. Learn how to lead by example and others will follow. Do a bit of research on how to develop leadership skills in your spare time and try to work on them throughout the day.