Yeah, I agree..
I kinda stuffed up my first economics asssessment task last year. But it doesnt really matter. In fact the first assessments are usually used to give you a taste of whats coming up so that you can be well prepared. The main thing is that if you did quite bad in your first assessment, it doesnt mean you have screwed your chances of a band 6, for I know eco hsc markers, and thus I kind of know abit of an insight.
Just make sure that when you do your half-yearly exam, Trial and HSC, you do good. These three are perhaps the most important. Doing extremely well in your trial and hsc itself will gain you within the band 5-6 range. The first couple of assessments you get in any of your subjects in year 12 only serve to tell you which direction your heading towards, so don't feel guilty if did bad, you will always have the chance to do well.
My second eco assessment is coming up this thursday.