nosuperstar, I think the best thing for you is to take some time out to find something that can help you let go of some of the stress, it's not something that should be built up.
I think any teacher that ignores their students efforts in aiming to do well should not be a teacher.
I don't know what to do though 
I agree, it was like a total throwback because i'm aiming for close to 50 in further and my teacher said because it's the most enrolled maths subject in vce, the highest we could get is in the 30's. 
Rubbish, you can definitely get that 50!!
As I think someone else has suggested, perhaps try doing some extra curricular activities outside of school. I think it'll give you something other than school, school, school to focus on. I'm personally thinking about taking up cricket, I think I sport is a great idea, even dance etc...
You could do something as simple as walking or jogging. I've found in the past year, that it is has had a profound affect in helping me unwind from my problems, whatever they may be, school, family, any sort of stress. It helps because I can bring the problem forward and tell my self what I think and just end it there, if it angers me, jog harder you know.. Although the reason I can do that is probably because I'm a shallow guy hahaha

With regards to workload stress. It may be obvious, but just try working a head by one or two classes? Most of my teachers have given out a full time table for the year which contains what we'll be doing in each week of classes. So I'm just working ahead two classes now and I'll spend time perfecting my bound reference and seeking help if necessary, during class.
Another benefit is that if some day(s) you just aren't feeling it (we all have those, surely), you know that you'll still be ahead!
Headstart for me has been alright thus far. Workload is increasing as each day goes by. We start off with a lot of theory and explanations so there a lack of homework being set at the moment, but that won't last long haha.
I'm feeling confident because I'm putting a lot of effort in every class and I'm feeling that it's helping me understand everything a lot better than I have this year. I really hope that I can keep this attitude up for the entire year because I think it'll be really beneficial in the long run.