Effective approach to 'unit 6 review fact or fiction' starts with understanding the context of unit 6. If it's related to a particular subject like history, know the historical background. Then, break down the content into smaller parts. For statements, check if they match with common knowledge or established facts in that field. For stories, look for elements that seem too good to be true or lack proper explanation. Use your prior knowledge and common sense. If something seems far - fetched, it's likely to be fiction. And always be critical of the information presented, don't just accept it at face value.
One way is to carefully read through all the materials in unit 6 again. Look for evidence or sources for each statement.