haha I'd recommend you to try the new Physics sample material here: http://educationstandards.nsw.edu.au/wps/wcm/connect/6b5246a2-9222-43db-8961-50ccee68d4d1/sample-questions-new-hsc-physics-exam-2019.pdf?MOD=AJPERES&CVID=
Because in the biology exam, question 3 in the 2019 syllabus practice...
I did a column graph as it had different vaccines every year, and the data wasn't continuous. See graph in: https://www.sciencenewsforstudents.org/blog/analyze/analyze-flu-vaccines-protection-varies
Yea, I wrote how a mutation causes a change in the genetic code... gene expression... etc...