Extension of residence permit
An application for extension can be submitted no earlier than four months and no later than one month prior to the expiration of your current permit. All application forms can be found on the relevant websites.
The application must be submitted to the Immigration Office (Udlændingekontoret) along with the documentation required for your original permit. Make sure all of this documentation is up-to-date, especially the confirmation that you are currently enrolled at the University.