tbh I haven't finished the entire sample exam- however MC seems relatively easy so far and the short answer questions are really easy. However when it came to the research methods part I got stuck- particularly the question that required plotting on a graph- I didin't even know how to label the axis!
NO- just because a subject is getting scaled up it doesn't mean its gonna be hard! Think of it this way, VCAA are scaling it up because we are the unfortunate bunch that has limited resources and has to deal with new content- that's all! And I'm not sure if it's been scaled up before- but it probably has when a new study design was introduced!
I wouldn't stress much- and even if you do end up getting a 25 in psychology- SO WHAT!!?? You are probably not gonna get that if you stop stressing, but if you keep stressing you will end up with a crappy score because you're mind will go blank on exam day!
Listen- there is no need to stress, there are a lot of students in your position right now, don't be the one that gets effected by stress- let that be somebody else- you can do this!
If you have any questions, please ask away, also how are you going content-wise?