IELTS is one of the international English language tests. This test measures the ability to communicate in English according to the four skills of Listening, Reading, Speaking, and Writing in people who want to study or work in English-speaking countries. The IELTS test is held in two different types, academic and general training:

TOEFL is one of the international English language tests organized by ETS Institute of Princeton University. TOEFL stands for Test of English as a Foreign Language and was first held in 1964. The TOEFL test consists of 4 skills: reading, listening, speaking and writing. This exam is held all over the world in 3 forms: CBT, PBT and iBT. The validity period of this exam is 2 years.

The GRE exam is conducted in two forms, paper-based and computer-based, which is not conducted in Iran.