I know many teachers and funding already works the way you describe: the better a school's students do, the more funding it gets (schools also get funding for the number of days the students show up).
What this does is make it so anyone with a pulse gets a passing grade.
What teachers actually want and need is the ability to fail people. At one district the math department wanted to fail a bunch of kids until the principal intervened, saying they should pass more people, and make exams worth less of the grade.
Teachers need the support from the state and the district to be allowed to fail students early in their academic journey so that students can get the help they need immediately and prevent them from reaching high school and still not knowing their times tables.
What this does is make it so anyone with a pulse gets a passing grade.
What teachers actually want and need is the ability to fail people. At one district the math department wanted to fail a bunch of kids until the principal intervened, saying they should pass more people, and make exams worth less of the grade.
Teachers need the support from the state and the district to be allowed to fail students early in their academic journey so that students can get the help they need immediately and prevent them from reaching high school and still not knowing their times tables.