Use the syllabus as your guide. Knowing ur syllabus is important so you know where exactly the crime question is coming from. Go through it, the dot points will be what ur paragraphs in the essay are on - select some to use (or use all of them for plans and merge some into the same paragraph - I merged sentencing factors & purposes for example)
Find LCMDI for the corresponding dot points - try to find LCMDI that overlap with other sections of crime eg. R v Skaf covers juries, appeals, sentencing, and parole. When you find cases that overlap with multiple sections of the syllabus, it makes memorising the content much easier.
Once you have that all set out, look at the themes & challenges and think about how you would adapt your lcmdi to certain questions (I did mind maps for this, id recommend) I wrote one plan for each topic and felt really prepared and confident going into the hsc for crime. Do this work now so you'll have it all done for trials, it makes life so much easier!!!