if u ask me, i think standard english is pointless.
Its not all that much easier than Advanced (the main diff is that they don't do shakespeare), and u essentially get scaled down.
I think the scaling we are talking about here is the conversion to a UAI. The HSC mark scaling is comparitively unimportant, if u just looking at the subjects u do. The HSC mark scaling is more concerned about caps (top marks, like 48 above the average or sumthin similar), school's performance and ur ranking.
Say u get 91 in X2 maths, the UAC would scale this to a UAC score of sumthin like 93/94, while for English advanced, a 91 would get scaled down slightly, to sumthin like 88/89. English standard would get scaled from 91 (which would be like a state rank, im serious) to sumthin like 84/85 by the UAC for ur UAI calculation. This is done so harder courses have more rewards than 'easy' courses. On the flipside, they determine how 'hard' a course is by the quality of candidature
For example, i do engineering studies, it is not an easy subject (its huge, like 5 massive modules) its actually quite hard, but does not have very benificial scaling because the quality of the candidates are quite low, due to the fact not many schools offer this subject. This means a low average, and a low UAC scaling. On the other hand, X2 maths (im just using it as in example), has a high quality candidature and so the average is higher and UAC considers it to be 'hard' and so it actually scales up (it's like the only subject, i think 4u english too, if u get like 70, the UAC would scale it up to like 80). One subject that bucks the trend is Latin and Latin extension, considered hard, but still scaled down. I think it has something to do with the really high raw marks people achieve. (Like 60% get B6, and like 90% get E4). Im not quite sure about it
Yeah, so thats the UAI scaling in a nutshell. It may not be completely accurate, but its wat i learnt from teachers, friends and the UAI estimator, and SAM.