Yehs. I think they do select specific questions from VCAA to add in Checkpts.
I thought that learning the chemical process in Photosynthesis was most difficult, you have to learn the INPUTS AND OUTPUTS and not to get it confused with Respiration, I think I also went to study the actual Chemistry of Biology part of Photosynthesis which was NOT even useful, but a waste of time. Had to learn the hard way!
Just know the equation and understand the inputs and outputs.
Also, the exam will definitely ask for an experimental analyis [prac], which you have to outline the actual process, don't stress too much about this as you would naturally learn this during the time spent with SAC's. The question last year was worth a whoooooooooping 10 marks or [5 marks on actual exam paper, can't remember] so make a fool-proof way of getting all the points down.
Back to photosynthesis, I wouldn't be worried that much about it as this had only concerned me. But for some, make sure you visualise the process happening in the cell of the plant[note; not all plants photosynthesise], and NOT just memorising notes listed as dot points from the whiteboard/projector.
Best wishes, ask further for more details if you don't quite get it.