The problem isn't the amount we're spending, it's how it's being spent. Everyone I know who is a teacher has severe issues funding class activities and are usually told they have $0 for supplies for the entire year. That tells me the money is being used in largely unproductive ways.

Where is the extra money going? Probably to pay for a bureaucrat to enforce the new standardized testing and feedback crap that isn't really helping all that much. Probably to fund more sports because sports, amirite? Probably paying for iPads that, while useful, aren't being use the way they're supposed to because of untrained teachers.

Wherever it's going, it likely isn't going to fund classroom equipment that teachers actually need or quality textbooks for students.