ANOTHER TIP:
for knowledge based questions describe cases in some detail and say how it applies to the principle-was D guity or not-why , not more that 2-3 lines
BUT in application questions just outline the case name and say if its similar or contrasting to scenario. you don't need to go into case facts
lastly if you cant apply ALWAYS write the description of it as you get more than half marks for it AND just write one line saying how you think it applies-you can at least get 1 mark if you cant say WHY it applies