You guys should be a bit more understanding!
This is a new course that is only several years old - you can't expect to have many experienced teachers around to teach this subject the right way.
My SDD teacher was a woodwork teacher teaching a computing subject for the first time. I think he did a fine job giving it a real shot at teaching a year 12 class even though he had trouble keeping up himself.
If your teacher can't teach the SDD course that well, then when the HSC comes you can't tell the BOS that you got a shonky mark because of your teacher. You have to do something about it now! Read from textbooks, summarise and practice!