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

1. Familiarize yourself with the exam format: Go through previous years' papers to understand the structure and pattern of the exam. Identify the types of questions asked, the scoring scheme, and the time allocated for each section. This will help you develop a strategy to manage your time effectively during the exam.

2. Practice time-bound mock tests: Set a timer and attempt previous years' papers within the allotted time. This will help you simulate the actual exam conditions and train your mind to think and solve problems quickly.

3. Identify common topics and concepts: Analyze the previous years' papers to identify the topics and concepts that frequently appear in the exam. Focus on mastering these areas first, as they are more likely to be tested again.

4. Solve problems using shortcuts and formulas: Look for shortcuts or formulas that can be applied to solve problems quickly. Practice solving problems using these techniques to increase your speed and accuracy.

5. Review your mistakes: After solving previous years' papers, review your answers and identify the questions you got wrong or took too long to solve. Understand the correct approach and solution for these questions to avoid making similar mistakes in the future.

6. Time management techniques: Develop time management techniques, such as allocating a specific time frame to each question or section, skipping difficult questions initially and coming back to them later, and avoiding spending too much time on a single problem.

7. Regular practice: Consistent practice is key to improving your problem-solving speed. Set aside dedicated study time to solve previous years' papers regularly. The more you practice, the faster you will become in solving problems.

Remember, while speed is important, accuracy should not be compromised. Focus on understanding the concepts and solving problems accurately, as speed will naturally improve with practice.