As all the residential colleges offer similar facilities and a high standard of pastoral care, it is recommended that you accept any offer received, even if it is not from your preferred college. You may not necessarily receive another offer in time for the start of semester.
Once you accept a college's offer and pay the Student Placement and Activities Fee, you are in a legal binding contract with them, and no other college can subsequently consider your application.
If you decline an offer you will need to inform the college who made you the offer and advise them that you wish to be placed on the waitlist which is held at the Student Accommodation Centre.
If you do not receive an offer in the first round, you will be automatically placed on the general waitlist for consideration by residential colleges as spaces become available.