DO NOT CONTENT DUMP!! so many ppl get into the exam, freak out, see the question, and DUMP everything they know on the topic/question instead of forming an argument.
Make your argument first, and then select evidence that backs this up. Consistently argue that the whole way through, always come back to your thesis/argument, WHY is this significant, what does this evidence show? Keep your argument really solidly in the front of your mind while writing.
Read the question carefully - pay close attention to the verb, what is the question asking you to do?
Make essay plans for conflict/national study with content aimed towards specific topics/questions/past questions, it saved me revising in the HSC. You also have a preset plan and content that helps you to avoid dumping everything in your brain.
I did Russia/soviet union if you have any specific questions. it's hard to say what you should have in it without seeing a specific question