International English Language Testing System (IELTS) measures the language proficiency of people who want to study or work where English is used as a language of communication. IELTS is available at more than 1,100 locations worldwide, including more than 50 locations in the USA, and there are 48 test dates a year.
The exam is the more advanced test. This version is generally used to determine whether candidates are qualified to enroll in undergraduate and graduate academic programs where English is the medium of instruction.
The exam is the simpler test. It focuses on basic survival skills in social and educational contexts. It is generally requested for candidates applying for immigration, working in certain professions, or studying at a non-degree level. The differences occur in reading and writing sections.
IELTS has 48 fixed test dates each year to ensure high levels of quality and security. The Academic version of the test is available on all 48 dates. The General Training version of the test is available on 24 dates. And the score is valid until 2 years.