If you need extra time due to extenuating circumstances, there is guidance in the Student Handbook about applying for extensions, including the forms to apply, and the extenuating circumstances policy.
Once you have checked you have grounds to apply (section 12 of the policy) and arranged appropriate supporting evidence (section 13 of the policy) you can submit your application via the helpdesk, or via learnersupport@oca.ac.uk
Note: If you need extra time due to a disability you have recorded with OCA, and have not had an extension on this unit due to this already, you can request up to 3 months by submitting a request on the helpdesk. See also Reasonable Adjustments - Additional time in the Student Handbook.