EQAO is a province-wide standardized test that all grade 9 math students must write. The test is typically written in January (semester 1 students) and June (semester 2 students). The Government of Ontarion has a lot of resources available for students, parents/guardians, and teachers online.
EQAO Grade 9 Mathematics information can be found at http://www.eqao.com/Parents/Secondary/09/09.aspx?Lang=E&gr=09