I bought Kamal's chemistry and biology notes and I have to say, they are the most cheapest and highest quality of all the notes I have seen. They contain highly descriptive and in depth information that would help you hit a high band 6 in the HSC. I was considering dropping biology as I thought...
If you're intending to band 4 maths, I highly intend you drop to general to aim for band 6, the scaling is much better in band 6 in comparison to band 4, but if it's too late, then don't worry too much about it.
And yes, what MilkyCat_ said, use the matrix atar calculator to check your atar...
For dentistry:
In Queensland university, you need an ATAR of approximately 99.05 and a competitive UMAT but you don't have to complete any interviews.
In Sydney university, you need an ATAR of approximately 99.50 and you do not require UMAT but have to complete interviews.
Hope this has made...