To renew a Norwegian Student Visa, go to the website of the Directorate of Immigration (UDI) and log in with the same account you used to apply. This should be completed three months before the expiration of your resident visa.
You will also need to make an appointment with the local police department to submit the required papers. Because setting up an appointment can take a few weeks, you should apply three months in advance.
In order to renew your Norway Study Visa, you must not be behind in your studies.