One way to measure the success of an educational system is to look at the test results of students. A current standardized test given to Washington State Students is the Smarter Balanced Test. The following is data that is currently published by the Washington State Office of Public Instruction. (1) Note that math scores are mysteriously low.
One purpose of adopting a corporate and personal state income tax for Washington State for Education in Washington State, is to help reduce class size and help both teachers and students in that specific way. Also this modern source of revenue could be used to reduce tuition at all Washington State colleges and universities.
1). Washington State Report Card, OSPI, Sep. 2018