When you do your CPL flight test, either the ATO, or recommending CFI will quiz you on each of your KDRs during the ground component.
If you look on the CPL test form (
http://www.casa.gov.au/wcmswr/_asset...cl/form090.pdf) in the ground section: 'Satisfactory knowledge of all KDR items'.
The best thing to do is after each test, review each KDR and write down the correct answer, then re-study these, as well as the other parts on the test form, before your flight test.