Quite an interesting unit. It covers on a lot of biostatistic techniques used in epidemiology. It does get quite difficult with the assessment. There's lots of little tricks to try and throw students off. My advice would be to get down a really solid understanding of the techniques (this unit does require quite a bit of study time) and then go throw the assessments slowly. Double check each question to make sure you haven't been caught out. For example, double check the units in the questions and what the question is specifically asking. The final is multi choice, so even if you've gone about the question the right way if you select the wrong answer (units or rounding or whatever) then obviously you won't get the mark.