It's not easy, but decide if the amount is reasonably justified by schools, how they'll spend the money, and if they're educating children well with what they have. Pay equal attention to local and state school board elections. Make a list of what you think is important and use it as your guide. These folks can have tremendous clout and are supposed to represent you. Make sure you vote, or don't complain.
Nobody understands all they entail, except insiders.
Learn the buzz words and their implications. You'll find radically different definitions depending on who writes them. Read all you can find before you decide. You can find glossaries in books, school literature and from advocacy groups. As you learn the jargon, you'll discern trends, patterns and agendas.