ATAR Estimate for a friend - Help! (1 Viewer)

[Socialism]

Can anyone help me out? Someone asked me for some help estimating an ATAR, but I'm still not sure how to do that...
We've got subject, then rank, then number of b6's. Their school rank is 59

Chinese Continuers: 4/6 (4 B6)
Chemistry: 55/80 (13 B6)
Physics: 60/88 (14 B6)
Math Adv: 66/148 (64 B6)
Math Ext 1: 73/84 (40 B6)
English Adv: 45/70 (15 B6)

thank you!!