In addition to the online application, you’ll need to submit a personal statement, letters of recommendation, transcripts, and a resume. If you are an international applicant or a non-U.S. citizen/permanent resident for whom English is not their first language, you will also need to submit official English Language Proficiency scores (TOEFL, IELTS or Duolingo).
For details, see the MSE-SSC Admissions page.