We currently limit the number of free Hour of Code activities that students can do depending on if they have a non-school account, free school account, paid school account. Once they have reached their maximum number of free levels, they will not be able to complete anymore Hour of Code activities without purchasing a home subscription.
Students can see the number of free levels that they have left by clicking on the My Missions tab. They will see text in the top right corner with the number of free activities they have left or saying that they have reached the maximum number of free activities.
Contact support@tynker.com with any questions. Please provide the username of the student if you have questions about a specific student's account.