On Maths Pathway reports, teachers can choose to include students' level data. Unless otherwise indicated, these levels correspond to the Australian Curriculum. Levels refer to content that has been fully mastered up to a point, based on year level content. That is to say your child knows 100% of the content leading up to the level shown in their level bar, and is fully competent with the maths in that area, where in a traditional maths setting, students can potentially be working at a year 9 level with only 50% of the knowledge required to do so.
Below is a level bar displaying a student's current data, which is similar to what you might see if your student's school decides to report module level data. The solid bar indicates the areas that we are sure about: content that has been mastered either on the diagnostic or through normal testing. In this case the student has mastered up to level 6.21.
In the example below, the grey bar is used to indicate areas that haven’t been tested on yet. Once a student has been fully diagnosed (by doing all four parts of the diagnostic), there shouldn't be any error bars. Where the error bar starts is the "worst case assumption" about a student's level. Conversely, the end of the error bar is the "best case assumption".