Your other subjects generally scale well, so if you're capable of getting good results in these it will be quite possible for you to get 95 +. Of course, you should try to do very well in standard english too for optimum results.
My school actually came first in the state for standard English last year, and being such a mathematical/sciency school, a lot of people were able to get 95+ for the UAI. One, because they got really good in standard English (we're talking 80+, top 2% of state) and because their maths (ext 1, ext 2) got them over the 98 barrier.
So definitely - if you do well in those high scalers you have, then 95+ is very possible.
definitely, hell you can get 99+ UAI doing std english, gen maths, textiles and other low scaling subjects, its just that its more difficult to do, but not mission impossible
blitz standard english and it will raise your UAI, provided you do well in other subjects too.......
do bad in advanced and it will lower your UAI.....
i suppose it does give some indication, but then and again, if u do good in standard english and all your other subjects, there is no reason why you cant get above 95