I agree with what has been said here,
the only real part of year eleven content in legal studies you should be well grounded in is the basic legal notions, as it was said they are the basis for law and society.
But they can not test your focus studies from year eleven, or so we have been told. but the hsc will examine you on law and society and human rights with multiple choice and short answer.
then there are your focus studies, for me they will be crime, famil and global.
in subjects like maths and what not, it is a different matter, 30% of questions can be on year eleven content.
Good Luck Mate