This post draws from TPPF’s comprehensive explanation of Texas school finance, available here.
It’s common to hear support for increased education funding—last year a statewide Texas Tribune / UT poll found that about 60 percent of Texans thought that added funding would improve public schools.  This isn’t shocking. Since the early 70s, most Americans have said we’re spending less than we should to improve public education, and only a fifth now say that we’re spending what we should to educate our kids. 
So how much are we spending in Texas? For the sake of context, we can start by noting that education is consistently the largest part of our state’s budget.  After sorting through all revenue, we found that PreK-12 spending is about $50 billion annually.