Yes, there are several techniques that can help increase your efficiency in solving previous years' papers for Commerce. Here are some tips:

1. Understand the exam pattern: Familiarize yourself with the exam pattern, including the types of questions asked, marking scheme, and time duration. This will help you strategize your approach while solving the papers.

2. Create a study plan: Develop a study plan that includes dedicated time for solving previous years' papers. Allocate specific time slots to practice different subjects or topics.

3. Start with easier papers: Begin by solving previous years' papers that are relatively easier. This will help build your confidence and understanding of the exam format before moving on to more challenging papers.

4. Time yourself: Set a timer while solving practice papers to simulate the real exam conditions. This will help you improve your time management skills and increase your speed in answering questions.

5. Analyze your mistakes: After solving each paper, thoroughly analyze your mistakes and areas where you struggled. Identify the topics or concepts that require additional focus and revision.

6. Seek guidance: If you are stuck or unable to understand certain concepts or questions, don't hesitate to seek guidance from your teachers, classmates, or online resources. Clarifying your doubts will help you solve similar questions more efficiently in the future.

7. Practice regularly: Consistent practice is key to improving your efficiency. Set aside regular time slots for solving previous years' papers and make it a habit to practice regularly.

8. Revise regularly: Alongside solving previous years' papers, ensure you revise the concepts and topics covered in your commerce syllabus regularly. This will help you recall and apply the knowledge effectively while solving the papers.

Remember, practice and perseverance are crucial in increasing your efficiency. Keep a positive mindset, stay focused, and learn from your mistakes to improve your performance.