Student Licenses Are Transferable
Please think of our student licenses as seats; if a seat is vacated, another student can use it. If one of your students is no longer using their license, you can delete their account, and another one of your students can use that student license. Just keep the total number of students in your account at any given time at or under the number of licenses you have purchased, and you are all set.
Please keep in mind that when a student's account is deleted, all of the student's data is deleted too. We do not yet have an archive feature (but it's in the works).