If I was considering being a “provider” of education to the top 5% of students and the bottom 20% of students, I’d actually forget all about the bottom 20%.
These kids are struggling. They find learning difficult and despite my best efforts I might not be able to get them over the line.
No, if I want to guarantee my bonus, I’d only work with the 5% of top students who learn quickly and easily and will guarantee my income.