Adding on the 'rigging SACs' bit, just make sure you are always actively sucking up. That means doing all homework, giving him/her lots of essays to mark, good class behaviour, punctuality and answering as many in-class questions as possible. Also, establish yourself as a likeable person in general. It all helps. During the year, I even wrote my teacher a letter she had to write for work. Anything you possibly can do, do.
In our class, the teacher publicly announced that she would be "adjusting" SACs, so a whole bunch of us basically started competing (a bit banterously but also kind of seriously) to "suck dick". It was funny but in retrospect, it's a bit sad that VCE Chinese is like this.