For admission to the University of Toronto's Engineering Science program, high academic performance is crucial, especially for international students. The program is highly competitive, with Canadian students typically needing very high marks. The discussion highlights that while the individual has achieved strong AS Level results (A's in Math, Biology, Chemistry, and Physics) and a respectable SAT score, the acceptance rate also depends on the overall applicant pool. It is recommended to check the specific admission requirements for international students from British-patterned education systems, as outlined on the university's official site. Maintaining high grades is emphasized, particularly in subjects relevant to engineering, as they enhance job prospects post-graduation.