The agency responsible for administering the province-wide tests in Ontario says most students do well in the three R's by the time they reach high school.
The Education Quality and Accountability Office say it's tracked students scores over the past seven years and found that students not doing well at the high school level also struggled in elementary school.
Chief Executive Officer Bruce Rodriques says it shows that educators and parents need to pay close attention to students' results on the provincial assessments.