It was provided to us by the good folks at ResQuE . This red stuff is subtext, added later for clarification and editorial comment.
Bold text is emphasis added by the editor.
School-based marks are reported to be higher when the quarter system is used. School-based letter grades may, however, be misleading. For example, school-based tests may simply be too difficult or too easy, relative to provincial norms. To find out just how well schools on the quarter system do when competing with schools on other timetable systems, one can use the results of the annual provincial examinations in various courses. Students in every school having Grade 12 write the same examination or an examination of similar difficulty.