look dont get so fixed up on your internal mark. I just wished everyone was told about how the interal mark gets used.
Your internal mark literally means nothing. It is the rank that come out of it that is important. Say for example, you are 2nd in the grade. Your internal mark is 85%, the first place mark is 90%. Then in the HSC the first place person gets 95, and you get 93. Then you as the second place person will get 93. Why? because the internal mark submitted to the BOS is a RANK. If you got 25% for your internal mark (still 2nd), while the first place getter got 30%, you will have still ended up with 93. What changes it is when in the HSC you get the first place. Then your HSC mark (say 95) is matched up with your internal rank (2nd, and if the person you took over as first got 93, then your internal mark will be 93). So your actual mark will be that average.
I dunno if you understand, its really hard to explain.
But for me, I ended up with a trial mark of 78/100 (I'm not supposed 2 know that!). My rank was tied 3rd with 4 people. My HSC mark was 96, my 3rd rank mark was 94, so I ended up with 95. So even though I got 78 in my trials, I obviously kicked ass in the HSC to get 96.
Im not saying that if your internal mark is 85, you're guaranteed a band 6. Look at your rank, use last years results as an indicator. If 1/3 ppl got band 6 last year, and your 2nd out of eg 40 students, then your pretty likely to get one a swell.