For studying in English-speaking countries, standardized tests are often required. The IELTS and TOEFL are widely accepted for proving English proficiency. The IELTS is preferred in the UK, Australia, and Canada, while TOEFL is common in the US.
For undergraduate programs, the SAT or ACT are standard in the US, while the UK may require A-Levels or IB diplomas. Graduate programs often demand the GRE (general or subject-specific) or GMAT for business schools.
Always check university-specific requirements, as preferences vary by institution and program.