You need to say specifically what things they're doing wrong.
Summer vacation should be eliminated. A two week vacation in December is completely unnecessary. Weeklong breaks should coincide with grading periods, which is to say breaks should be used for grading and preparation of next semester's instructional material. Essentially school should be year round.
School start times must change to suit the biological sleep cycle of the students they serve. School must revolve around students not teachers or sports or the sleep cycle of adults.
Move to the European club model of sports rather than school sponsored sports. At the very least, sports which routinely cause serious head injuries, football and soccer, must not be allowed in an institution that purports to be concerned with the intellectual development of young people.
Make it mandatory that high schools provide shop classes.
Make it mandatory that high schools provide computer programming courses.
Make it mandatory that all pre-k, K, and grade schools must provide second language education as well as English acquisition classes for students whose parents do not speak English.
Provide a healthy breakfast and lunch for ALL students. Meals must be based on the glycemic index in order to give students the best performance possible.
Provide a pay differential for teachers, which is to say that math or computer science teachers should be paid more.
Students that make trouble in the classroom must be sequestered away from students that do not.
Mainstreaming students with special needs without sufficient support staff harms the bulk of students. Schools must hire more counselors, 504 and IEP specialists and speech language pathologists to support the needs of today's students.
Outlaw online education, as it harms underprivileged students the most.
And that's just coming off the top of my head. If the the above policies were followed, I'm confident our education system would see great gains, and our nation would benefit.