Diploma requirements

30 Credits


Students must complete;

18 Compulsory Credits

12 Optional Credits

Transfer of Credits

The compulsory credits are to be taken during the 4 years of high school, between grades 9 and 12. When a student transfers into Keystone International Schools, all credits from previous schools will be assessed as per their transcript. Equivalencies will be granted based on their previous schooling.



The Ontario Secondary School Literacy Test (OSSLT) is a compulsory standardized test for secondary school students in Ontario who wish to obtain the Ontario Secondary School Diploma. The OSSLT is written every year in March in all public, private and Catholic secondary schools in the province of Ontario. 

If you are reside outside of Canada, you can take the test on the same day proctored at a local school vouched by Keystone International Schools.

Community Service

students hugging eachother

Every student must complete a minimum of 40 hours of community involvement activities as part of the requirements for an Ontario Secondary School Diploma (OSSD). The purpose of the community involvement requirement is to encourage students to develop awareness and understanding of civic responsibility and of the role they can play and the contributions they can make in supporting and strengthening their communities.