Here is the order form.
You have to get it via your teacher.
I couldn't upload the xls file so compressed it to a zip file.
So basically you give the order form to your teacher. Then they multiply $20 by however many 4 unit students your school has, fill out the form and send it to
DS@sydgram.nsw.edu.au and they will send the pdf back to your teacher.
Payment is to be made out to
SYDNEY GRAMMAR SCHOOL
College Street, Darlinghurst, 2010
(attention - The Accountant)
Telephone: 9332 5800
ABN: 41 834 774 356