Also, how well are you preparing them pedagogically to learn the music? I know not every kid will be perfectly prepared for all of life's musical struggles but are your students aware of 16th notes and high B-flats outside of their region music?
For example, with my MS program, we make sure the kids know all of their scales (including chromatic), and we also teach all forms of rhythm (using Teaching Rhythm Logically) so that kids have every tool and nugget of knowledge they need to learn the music.
And then, we chunk the music into 8 measures for weekly chair tests, so it's more attainable.
I have the same kind of kids here - god forbid 16th notes exist lmao