Dont try and do your best in this subject. In the end all that really matters is your final HSC test. Thats all that counts. Of course you'll need to hand in assessment thinga's but dont go out of your way to get 100% in the assessments cause they dont mean anything!
i had friends who did it too- they said it was hard work since u had work experience and stuff that u had to do...but it was good in the sense that they found a job in retail as soon as they left school (alot of the students that is).
Retail isn't high on my priority list, though I've met people who have built solid careers in it. The pay isn't quite like Law, and the conditions aren't quite like Business, but it's good honest work and you come home to a good life.