i don't see how it is any more informative than the official data published by VCAA
It is a re-organised form (in many permutations) of the data published by VCAA
the data here doesn't take into account the total number of students sitting a 3/4 subject so that larger schools have a natural advantage if you only measure the
number of study scores above 40 rather than the
percentage of study scores above 40 (official stats from VCAA measure percentage)
the VCAA data is already plagued enough by not taking into account differences in the strength of competition between studies (using scaled scores will fix that) and that many students at independent schools take the IB which do not generate "study scores" (using median ENTER or percentage of ENTERs above 90 will fix that)