Are there not standardized exams in Ontario high school? When I grew up in Alberta standardized exams took up half your grade and those could not be fudged by your teacher.
The exams were made by a small panel of teachers and nobody else knew the exam contents until the day of the exam. Everyone across the province takes the exam on the same day and time. Exams were proctored by people external to the school. Exams are again marked by a panel of teachers outside of your school.
Cheating is nearly impossible outside of someone leaking the exam early.
That seems like the real failing of the Ontario education system. Standardized testing is needed otherwise there is nothing stopping teachers from gaming the system.
It also gives a good way to determine underserved/underperforming schools in order to direct improvement there.
The exams were made by a small panel of teachers and nobody else knew the exam contents until the day of the exam. Everyone across the province takes the exam on the same day and time. Exams were proctored by people external to the school. Exams are again marked by a panel of teachers outside of your school.
Cheating is nearly impossible outside of someone leaking the exam early.