The quality of preparation for college provided students by Ontario's educational system was assessed. First-year university achievement was compared for students from Ontario's Grade 13 and for students from the final matriculation year or equivalent of other Canadian provinces. University admission procedures were also studied to determine to what extent special requirements or adjustments were made for students who completed their secondary school education in different provinces. Additionally, the university achievement of the better students and the adjustment problems of all students in the first and second years of the university were examined. Four Ontario universities and two out-of-province universities that enrolled a significant number of students from Ontario were evaluated. Findings include the following: where secondary school grades were either specified or implied as admission requirements, Ontario students were typically allowed to gain entry into Ontario universities with the lowest grades of all students, followed by students from Quebec, Western Canada, and Atlantic Canada; in the Quebec university admission requirements to the arts, science, and commerce programs equate Ontario Grade 13 graduates with year of College d'enseignements generale et professional graduates and require students from other provinces to take a qualifying year; in comparison with students from other provinces, Ontario students in Ontario universities tend to receive higher marks in engineering and do as well or better in arts, science, and commerce; Ontario students tended to enter the university at a later age than students from all other provinces except Quebec. (SW)