Both mind maps and case studies can be effective study tools for Commerce, so it ultimately depends on your learning style and preferences. Here are some factors to consider:

1. Learning Style: If you are a visual learner and prefer organizing information in a visual format, mind maps can be a great tool. They allow you to create a visual representation of the topic, connect related concepts, and see the bigger picture. On the other hand, if you learn better through practical application and problem-solving, case studies can provide a more hands-on approach to understanding real-world business scenarios.

2. Content Review: Mind maps are useful for summarizing and reviewing concepts, theories, and key points, making them ideal for content revision. They help you condense information into concise and memorable formats, which can be beneficial for exams. However, if you want to apply your knowledge to real business situations and develop problem-solving skills, case studies can provide you with practical examples and challenges to analyze.

3. Exam Preparation: Mind maps can be useful for reviewing and memorizing content, especially when it comes to definitions, formulae, and theories. They can help you organize your thoughts and visually map out the connections between different topics. On the other hand, solving case studies can help you develop critical thinking, analytical skills, and the ability to apply theoretical knowledge to real-world scenarios. This can be particularly helpful if your exams involve case study analysis.

4. Time and Resources: Consider the time and resources you have available. Mind maps can be created using pen and paper or digital tools, and you can revise at your own pace. Case studies, on the other hand, may require more time as you analyze the situation, consider different perspectives, and develop a solution. They may also require access to case study materials or textbooks.

In conclusion, it can be beneficial to incorporate both mind maps and case studies into your Commerce revision. Use mind maps for content review and to visualize connections between concepts, while case studies can help you apply your knowledge to real-world scenarios and develop problem-solving skills. Adapt your study approach based on your learning style and the specific requirements of your exams.