Choosing IELTS gives you more options for the future. IELTS is accepted by more than 10,000 organisations in over 145 countries. This includes:
Universities, schools, training colleges and tertiary institutes
Government departments and agencies
Professional and industry bodies
Companies and employers.
Universities, colleges, employers and migration bodies each set their own IELTS score requirements, depending on the level of English they require for their purposes. That's why the score you are asked to demonstrate for entry to high school is different from the score you are asked to demonstrate for professional registration.
Please note this data is updated weekly. It's always best to confirm the score you need directly with your chosen organisation.