Yes, there are several techniques you can use to enhance your problem-solving accuracy using previous years' papers for Commerce. Here are a few:

1. Understand the exam pattern: Start by analyzing the exam pattern of previous years' papers. Identify the types of questions asked, the weightage given to different topics, and the time constraints. This will help you prioritize your preparation and allocate time accordingly.

2. Identify common themes: Look for common themes or recurring topics in previous years' papers. Focus on understanding these topics thoroughly as they are more likely to be asked again in the upcoming exam.

3. Practice time management: Solve previous years' papers under timed conditions to improve your time management skills. This will help you get familiar with the exam's time constraints and train your mind to solve questions within the given time frame.

4. Analyze your mistakes: After solving previous years' papers, carefully analyze your mistakes. Understand the reasons behind each incorrect answer and learn from them. This will help you identify your weak areas and work on improving them.

5. Take mock tests: In addition to solving previous years' papers, take mock tests designed specifically for commerce exams. This will give you a real-time exam experience and help you assess your preparation level.

6. Seek guidance: If you come across difficult or challenging questions in previous years' papers, don't hesitate to seek guidance from teachers, mentors, or online forums. Discussing these questions with others can provide you with different perspectives and help you understand the concepts better.

Remember, while solving previous years' papers is beneficial, it is equally important to thoroughly understand the underlying concepts and practice a wide range of problems related to each topic.