To apply for a place on an undergraduate course (BA/BSc) you need to have completed your high school education (12 years) and have a pass equivalent to two UK A level passes, and have the required English language qualification.
UK Requirements: 48 UCAS tariff points including 32 from at least 1 A-level or equivalent
Canadian Requirements: High School Graduation Diploma (5 subjects at pass)
Visit here for further details about each country's entry requirements.