Be aware that the one year of employment starts from the date that your ARC was issued, not when you may have signed the contract.
And, as far as I’m aware (coming from my wife who manages a buxiban) you are entitled to 7 days paid holidays after your first continuous year of full-time employment (14hrs/week) in the next working year. Therefore, if you work only one year and do not continue employment with the school after the one year period the school is not required to pay holiday pay.