The OSSLT measures whether students are meeting the minimum standard for literacy across all subjects up to the end of Grade 9. Successful completion of the literacy test is one of the requirements to earn an Ontario Secondary School Diploma. All students across the province write this test.

As the literacy graduation requirement for all students graduating during the 2024–2025 school year has been waived, graduating students do not need to take the OSSLT.

The administration of the OSSLT will take place from

Tuesday, November 5, to Tuesday, December 3, 2024, with individual student results reported early January 2024.

Tuesday, March 18, to Tuesday, April 15 2025, with individual student results reported by the end of May 2025.