I cable tied mine, ask around people have spare cable ties

Quote from VCAA:
"
Your bound reference must not include:
• pages or parts of pages that can be detached from the
bound reference during the examination
• fold-outs, maps or brochure-style components
• removable tabs, post-it notes or other pages or material
designed to be detached
• forms of collation/binding that are designed to be
non-permanent and the content modified by insertion
including:
– ring-binder folders
– plastic A4 sleeves (permanent or removable) from
which pages may be removed
– manila and similar folders with clip, clamp, slide and
metal prong binding of loose-leaf material
"
source:
http://www.vcaa.vic.edu.au/Documents/vcaanavigator_web.pdf