Some countries do it differently, rather than one test determining your entire post-high-school future. Canadian universities do not require external standardized tests for their domestic applicants, but that is because they trust that, at the province level, a high school course is consistent in its content, rigor, and grading across various high schools (not likely to happen in the US). The UK-based systems appear to use standardized final exams for high school courses (O-levels and A-levels), but those are more like SAT subject and AP tests than SAT reasoning tests.