I was just kinda thinking something over, and since 99% of the accounts that follow me are 'bots, I'm not really expecting any feedback. But I'd love to hear some reasons why this would and wouldn't work.
School districts are local. Okay, I get that, kinda of, in that it's hard to administer all schools in a state centrally. Let's go with that.
But funding for schools is also mostly local--a percentage of funding does come from the state and federal gov't--and is paid for by property taxes. As near as I can see, property taxes are largely a flat assessed value, and based solely on local conditions. Those property taxes then go to local school districts. So if your district is wealthy, you're going to have better school facilities, be able to pay teachers more, etc. than a poorer municipal area. (As an aside, I grew up in a very wealthy town, and despite having only 400 students, total, in my high school, we had fantastic facilities and equipment, and some of the best teachers in the state.)
It's pretty clear that poor urban areas have shittier schools--both facilities and teaching in general--than much wealthier school districts.
So why do it that way?
Why not make property taxes a state-level tax--no special millages, etc.--and make funding for all schools in the state per student funding, regardless of where the school is located? That removes the advantage that wealthy school districts, and hence students from wealthy families--have over poor school districts, so that they are competing more on merit rather than money.
In addition, why not make the property taxes progressive, based off the entirety of your assessed property values, and apply the same formulas to businesses and commercial properties that are applied to residential? (You'd have to make some kinda of exception for agricultural or undeveloped land that would strongly discourage conversion or development.) Flat taxes are generally regressive and disproportionately affect poor people, so it would make sense to tax higher value properties at a higher rate.
An absolutely critical part of all of this would be eliminating all local funding from schools; schools would need to use only state or federal monies. By "all local funding", I mean that schools would not be allowed to hold bake sales, etc. to raise more money.
A serious downside I can see is that you'd need a way of tying all of this into CPI or inflation rates, so that revenue would track with increased costs. You'd also need to make sure that education revenue couldn't be touched by any other thing, and that taxes couldn't be cut at some point in the future; you'd probably have to write at least some of into a state constitution.
BTW, I am a property owner, and yes, my taxes have gone up this year. Mostly because the house that I bought for under $100k is now "worth" a little over $300k, just five years later, which seems crazy, except that the housing market is nuts right now.