As an international student from outside the European Union you also need to (re-)enrol via Studielink. You can only re-enrol when you have a valid residence permit. Most, but not all, residence permits are renewed annually.
Academic requirements for residence permit renewal
The Dutch government has set certain standards that you have to live up to for your student residence permit to be renewed. At the end of every academic year, you have to have successfully completed courses with a total minimum course load of 30 ECs. The National Immigration Services dept requests a proof of progress for every international student in July. You do not have to provide these documents yourself, this is done for you by Student Affairs of the Faculty of Science. If you are in the middle of an internship or research project and have not yet been awarded any ECs for your work, your supervisor will be asked to vouch for your progress.