Raw mark in external exam to peak 85 ATAR? (1 Viewer)

[Startales]

Hey all, was wondering what kind of marks i would need in the external exam to get around 85 ATAR

School rank - 74

English Advanced (51/53) - 50% average assessment results
2U Maths (36/80) - 60% across the year
Economics (11/43) - 85-90% for most assessments cept for trials which i bombed at 72%
Senior Science (4/18) - 75% across the year
Business Services - (No ranking due to it being a VET subject)

Thanks for any feedback!