If you ask to defer your CAO Offer, you are asking to postpone your start of study until September next year.
if your request is granted, the place you were offered this year, will be reserved for you until next year.
If granted, your offer of a place will remain regardless of any changes to the points between now and next year.
You will need to carefully re-apply to the CAO before February 1st, as a “Deferred Applicant”.
The CAO will then re-issue your offer next year.