Since 1959, the American Language Institute (ALI) has been providing English language instruction, assessment, and resources to support the academic and professional success of non-native speakers of English pursuing degrees at USC. The ALI offers English language courses for those students who want to improve their English as well as those who are required to take classes as a result of taking the International Student English (ISE) Exam. The ALI is also responsible for testing and providing English language instruction for the university’s international teaching assistants.

Academic success at USC depends on your ability to communicate effectively in English. All international applicants whose native language is not English must demonstrate English proficiency.
(https://admission.usc.edu/apply/international-students/#/additional-requirements)

The ability to communicate effectively in English-to read, write and speak the language fluently-is vital to your success as a university student, and may also serve as a vital tool in your future academic and professional success. USC graduate students are therefore expected to demonstrate proficiency in English at all levels of graduate study. (http://gradadm.usc.edu/lightboxes/international-students-english-proficiency/)