Yes, there are several tips to improve your problem-solving efficiency using previous years' papers for Commerce. Here are a few:

1. Familiarize yourself with the exam pattern: Understand the structure and format of the exam by analyzing previous years' papers. This will help you identify the types of questions asked, the distribution of marks, and the time allocation for each section.

2. Identify common topics and concepts: Look for recurring topics and concepts in previous years' papers. This will give you an idea of the important areas to focus on while studying.

3. Solve papers under exam-like conditions: Create a timed and distraction-free environment while solving previous years' papers. This will help you practice time management and simulate the actual exam conditions.

4. Analyze your mistakes: After solving a paper, thoroughly analyze your mistakes and understand the correct solutions. This will help you identify your weak areas and work on them.

5. Practice regularly: Solve as many previous years' papers as possible to improve your problem-solving skills. Regular practice will help you become familiar with the exam pattern and develop effective strategies for different types of questions.

6. Seek guidance if needed: If you face difficulty in solving certain questions or concepts, don't hesitate to seek guidance from teachers, mentors, or online resources. Understanding the concepts thoroughly will enhance your problem-solving efficiency.

7. Track your progress: Keep a record of your performance in each paper you solve. This will help you track your progress over time and identify areas where you need further improvement.

Remember, the key to improving problem-solving efficiency is consistent practice and analysis of previous years' papers.