Why is there a minimum TOEFL/IELTS requirement?

The Summer Intensive College English has been designed to address the specific needs of students who plan to attend a high school or an undergraduate program in the United States. In order for students to get the most out of the program, they need to have a minimum English language proficiency that will enable them to do the work expected of  high school and college students. Students who cannot meet the language proficiency requirement will not be able to follow the English for Academic Purposes curriculum necessary to successfully complete the program.