If you don’t have a support plan and due to serious circumstances beyond your control you need more time for your coursework, then submit your EC claim (with evidence, if applicable) before the coursework deadline.
If you have a Support Plan and it already allows for deadline extensions, follow the extension process described on the Student Services webpages (rather than submitting an EC form). [add link to the form to submit an EC claim]
If you are still unsure as to which process to follow, take a look at this handy tool to help guide you through: