From what I've read already, I ca see that there are lots of people asking about how to increase their range. This isn't necessarily the case for me. I'm perfectly content with my range, I'm just wondering if there are any specific exercises for note accuracy in the partials that are close together over the F above the staff. I can hit notes an octave above that, but it's highly unpractical. I've been playing since I was in 6th grade and I'm a senior in high school about to graduate. I simply want to keep going after I graduate.

Any recommendations would be extremely helpful!