1817cef5_ington_Homeschool_Organization__Homeschooling
[0] What are the testing requirements? Progress for full time students shall be assessed at least annually using the state assessment (WASL) for the student’s grade level and using any other annual assessments required by the school district. [Homeschooling] 
There are two testing options: * standardized achievement test* non-test-based assessmentThe results remain in the home.
Alternative Education - Washington Homeschool Organization
Homeschooling