I haven't gotten mine back yet however:
It depends on the marking criteria. i.e. if it says you need 3 or 4 things for 3 marks then you need to give those 3 or 4 things
IT also doesn't matter how hard you are marked as you are in the same boat as your whole cohort. In the end it's about ranking and you're compared to other schools who may have marked their cssa easier until the actual external exams