Minimum requirements for UK qualifications:
1. Four subjects in one of the following combinations:
3 A-levels + 1 GCSE/O-level/AS level
or 4 A-levels
2. Five subjects in the following combination:
2 A-levels + 3 GCSE/O-levels/AS levels
Notes:
1. No subject may be counted at two levels.
2. All GCSE/O-level grades must be C or above.
3. An exam in Mathematics is required (at least GCSE/O-level).
4. Candidates to science-related majors must have at least a GCSE in a science subject in addition to an exam in Mathematics. It is highly recommended for candidates to have at least an AS in Mathematics.
Canada
Ontario: OSSD, including a minimum of 6 OAC or 4U/4M courses.
Quebec: High School Diploma + CEGEP Diploma
Other Provinces - according to requirements of the University of Toronto.