ATAR Estimation ASAP PLZ (1 Viewer)

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My hsc marks were
Advanced english - 85 B5
ancient history - 86 B5
visual arts - 84 B5
general maths - 69 B3
biology - 74 B4
history ext - 33 E2

my school rank in 2010: 142
2011: 121
2012: 162
2008: 133

i go to a selective competitive school