Proposition 123 unofficially passed on Tuesday in a special election with 259,983 votes yes and 245,219 votes no.
Prop 123 will increase funding for kindergarten through 12th grade education by $3.5 billion.
Opponents of the proposition say it's deceptive and in the long run would end up hurting the state.
Prop 123 will change Arizona's constitution. Money will be taken out of the state's land trust and put into the education system.
The state land trust is a fund that was set up when Arizona first became a state as a way to pay for K-12 education.
Supporters say this is a great way to use money that's been just sitting on the sidelines.
However, opponents argue that it will deplete the state's land trust fund and is not a permanent solution for school funding.