are used to assess the user's proficiency in a language. There are several different tests on Duolingo:
  • A placement test can be taken at the beginning of a course to determine how advanced the user is and let them skip ahead according to their skill level.
  • Similarly, test-out tests let the user skip ahead through individual skills or up to checkpoints in the course if the user completes the test successfully.
  • Progress quizzes can be used to gauge progress in a language and produce a score out of 5.
  • Duolingo Test Center is a separate application that administers a language proficiency test and produces a score out of 10 that can be shown to prospective employers or schools.