if i were you, id get the same department note you got back then, maybe even get a new updated one, go with your half yearly report and and proof of achievements and extracurriculars you have (basically showing that you are a good student and they should take you) and go organise a meeting with the principal or smth
might not work but from what i hear abt strathfield girls they care abt their ranking a bit too much so if you can show youre smart, they are being unreasonable and they should consider you they might do it idk. try this next term tho dont wait until next year