On EnglishCentral we track everything language related that you do. This includes the videos you’ve studied or are in the process of studying. Just go to the video browse page when logged in and look at the top left part of the page.
Students can see all their videos in progress and all the videos they’ve completed. Further, students can favorite videos and make their own library for future study/reference. (just click the star in the top left corner of every video) The same goes for teachers. The same goes for vocabulary and keeping track of words.