I was envisioning primarily in person tutoring, which has been effectively done for a very long time. That said, online tutoring is an option that many can and would employ. That a few kids might need a different structure is a very good argument for the flexibility of tutoring.
We already transport students and people already commute to work. The money you currently pay to stick kids in your school district on a bus can be used to facilitate transportation for tutoring. Some tutoring services may provide a central location while others may bring the tutor to you, and you pick the one that works best for your family.
As for your other points:
Dedicated daycare facilities can be more efficiently set up if that is their only objective. Effectively teaching hundreds of students at the same time is impossible, so you need dozens of teachers and classrooms. But if your only concern is making sure they don't kill eachother, you can easily throw a few hundred kids in a gym or a plsyground and tell them to have fun with only a small handful of moderators - which is exactly what most schools do during recess. A good portion of the current school population probably doesn't even need such services (if your 18 year old needs to be babysat, they're going to have a very rough time at 19).
School creates the logistical problem of getting kids to and from school. Again, the bus you're already paying for can take people to a school or a shared learning center or a library or a tutor's office.
The money you are paying to maintain the school science lab can also be spent to support a community science lab. This building can be much smaller, less staffed, and more optimally configured than a full highschool
The money you spend to support a school computer lab can also be spent to support a community computer lab. In general this already exists at most public libraries. The same argument as for the science lab applies here.
The money you spend to support school lunches can also be spent on food programs.
When all you have is a hammer, everything starts to look like a nail, but a hammer is not the right tool for many jobs. Likewise when all you have is a school, every societal need related to children starts to look like a school problem, but that does not mean school actually solves those problems in an efficient way. It really does not take any great mental leaps to imagine services dedicated to solving individual problems being more efficient than something that was never originally intended to solve that problem.
We already transport students and people already commute to work. The money you currently pay to stick kids in your school district on a bus can be used to facilitate transportation for tutoring. Some tutoring services may provide a central location while others may bring the tutor to you, and you pick the one that works best for your family.
As for your other points:
Dedicated daycare facilities can be more efficiently set up if that is their only objective. Effectively teaching hundreds of students at the same time is impossible, so you need dozens of teachers and classrooms. But if your only concern is making sure they don't kill eachother, you can easily throw a few hundred kids in a gym or a plsyground and tell them to have fun with only a small handful of moderators - which is exactly what most schools do during recess. A good portion of the current school population probably doesn't even need such services (if your 18 year old needs to be babysat, they're going to have a very rough time at 19).
School creates the logistical problem of getting kids to and from school. Again, the bus you're already paying for can take people to a school or a shared learning center or a library or a tutor's office.
The money you are paying to maintain the school science lab can also be spent to support a community science lab. This building can be much smaller, less staffed, and more optimally configured than a full highschool
The money you spend to support a school computer lab can also be spent to support a community computer lab. In general this already exists at most public libraries. The same argument as for the science lab applies here.
The money you spend to support school lunches can also be spent on food programs.
When all you have is a hammer, everything starts to look like a nail, but a hammer is not the right tool for many jobs. Likewise when all you have is a school, every societal need related to children starts to look like a school problem, but that does not mean school actually solves those problems in an efficient way. It really does not take any great mental leaps to imagine services dedicated to solving individual problems being more efficient than something that was never originally intended to solve that problem.