Uhh. Table A3 has nothing to do with bands, and nothing about bands is included in the document.
The 44.2 for Chemistry means that a mark of 44.2/50 (i.e. 88.4) would have placed you at the 90th percentile (i.e. top 10% of the state) in 2002. All the marks in the P<sub>90</sub> column mean this; and, similarly for the other columns, the number written as a subscript below the P refers to the percentile. As is stated at the top of the document.
You can't compare HSC marks to scaled marks - you should only use Table A3 to compare the distributions of scaled marks between courses.