Here are links to some important Ontario Ministry of Education Policies that guide and inform the practices of every public, private, and online school in Ontario.

Ontario Schools, Kindergarten to Grade 12: Policy and Program Requirements, 2011.
http://www.edu.gov.on.ca/eng/document/policy/os/ONSchools.pdf

Growing Success: Assessment, Evaluation and Reporting in Ontairo Schools, 2010.
http://www.edu.gov.on.ca/eng/policyfunding/growSuccess.pdf

More Ontario Ministry of Education documents surrounding educational and curricular policies can be found on their website:
http://www.edu.gov.on.ca/eng/