The report is a representation of assessments and other class work, it should tell you your rank, the class average, and your average. Make sure to look at all the data given to you, instead of drawing conclusions from one point.
NESA counts your best 10 units towards your ATAR, so if it's just the one subject maybe don't worry too much. However, if it is recurring across multiple subjects I don't think it is possible to get over 90 ATAR. Speak to any advisors and your teachers for each subject that you are not doing well in, find your weak points, and grind until you are more confident with your understanding.