Yes, there are several techniques you can use to enhance your problem-solving efficiency using previous years' papers for Commerce. Here are some strategies you can try:

1. Reviewing the question patterns: Look for common question patterns that have appeared in previous years' papers. This will help you understand the types of questions that are frequently asked and the specific skills or knowledge areas that are commonly tested.

2. Analyzing the marking scheme: Pay close attention to the marking scheme or answer key provided with the previous years' papers. Understand how marks are allocated for each question and the specific criteria that are used for evaluating the answers. This will help you align your responses with the expected format and structure.

3. Time management: Practice solving previous years' papers within a specific time limit to improve your time management skills. Set a timer and try to complete the paper within the given time frame. This will help you develop a better understanding of how to allocate time for different sections and questions during the actual exam.

4. Identifying knowledge gaps: While solving previous years' papers, pay attention to the questions you find difficult or unable to answer. These questions can help you identify your knowledge gaps and areas that require further study. Make a note of these topics and prioritize them in your study plan.

5. Practicing under exam conditions: Simulate exam-like conditions while solving previous years' papers. Find a quiet and distraction-free environment, set a strict time limit, and avoid referring to any additional study materials or notes. This will help you get accustomed to the pressure and time constraints of the actual exam.

6. Seeking guidance: If you come across any questions or concepts that you find particularly challenging, don't hesitate to seek guidance from your teachers, professors, or fellow students. Discussing difficult questions and concepts with others can provide you with different perspectives and help you gain a deeper understanding.

Remember, the goal of using previous years' papers is not just to solve the questions but to learn from them, identify your strengths and weaknesses, and improve your problem-solving strategies.