Your ATAR is built from an aggregate: the best four scaled scores plus 10% of a fifth and sixth. Enter your scaled subject scores and see where you land.
Your top four scaled scores (out of 50) are added, then 10% of a fifth and sixth subject is added to the aggregate.
A raw 40 in Methods scales higher than a raw 40 in General Maths — always use your scaled scores.
ATAR 90 means you beat ~90% of your year level cohort.
Cutoffs shift yearly with cohort strength. Check your state authority's published conversion tables.
Plan your score, choose your subjects wisely.