I'd make schools smaller and put them back into the local community, including the responsibility for making them good schools. Our School District just built a High School that is sized for 2000 students, kids from 4 different towns. Personally I don't consider that a High School - more of a factory. When I send my kid to school I want every single teacher/staff member in the building to be able to call him by name. That is one of my main reasons for not sending my kids to that school.
I'd go back to the basics. English, Math, Science and Social Studies. I'd quit rushing toward every new and improved Math and Reading program that the textbook publishers put out and I'd insist that the schools realize that in the end 8 x 9 = 72 today the same that it did 50 years ago and we really don't need twenty new methods of teaching it. What we need is an insistence that kids learn it.
I'd end Tenure. I'd fire bad teachers and the administrators of failing schools.
I'd quit insisting that schools be parents. Schools shouldn't be responsible for childhood obesity, health care or teaching "values" or any of the other feel good stuff that is a parental responsibility and they have no business doing any of that until they get better at what their job is supposed to be, teaching Reading, Math etc etc