In Ontario, Canada, a final grade is/was required for those students who plan on continuing to a University. Ontario is the only place in North America with an extra year of high school.

Currently grade 13 is refered to as Ontario Academic Credit.

Ontario Academic Credit will be abolished in Ontario, in 2003, resulting in both grade 12 and 13 students applying to university at the same time. Ontario instituions are bracing themselves for an overcrowding of students.

I avoided grade 13 by moving to Massachusetts :-)