In NSW, your HSC mark in each course is half school-based assessment and half the final exam. Your ATAR is then a rank from 0 to 99.95, calculated from scaled marks.
Don’t neglect school assessments
School assessments are moderated, but your rank within your school still matters. Treat every assessment task like part of the final exam.
Plan your trial exams
Use trials as a full rehearsal: timed papers, exam-room conditions and a mistakes log afterwards.