Yes, you can definitely use previous years' question papers or sample papers for practice in CBSE Class 10 exam preparation.

Using previous years' question papers or sample papers can be immensely helpful in preparing for the CBSE Class 10 exams. They provide a clear understanding of the exam pattern, marking scheme, and types of questions that can be expected. Here are some reasons why you should consider using them:

1. Familiarity with the Exam Pattern:
- Previous years' question papers and sample papers give you a clear idea about the exam pattern and structure.
- You can understand the distribution of marks, the number of sections, and the types of questions asked.
- This helps you plan your time and strategy for the exam.

2. Practice with Variety of Questions:
- Previous years' question papers cover a wide range of topics and concepts.
- By solving them, you get exposed to different types of questions that can be asked in the exam.
- This enhances your problem-solving skills and improves your speed and accuracy.

3. Self-Assessment:
- Solving previous years' question papers and sample papers allows you to assess your knowledge and understanding of various topics.
- You can identify your strengths and weaknesses and focus on improving the areas where you struggle.
- It also helps you evaluate your preparation level and make necessary adjustments.

4. Time Management:
- Practicing with previous years' question papers helps you develop effective time management skills.
- You become familiar with the time required to solve different sections and allocate your time accordingly during the actual exam.

5. Confidence Building:
- Solving previous years' question papers gives you a sense of confidence as you become familiar with the exam format.
- It reduces exam anxiety and boosts your self-confidence, allowing you to perform better in the actual exam.

In conclusion, using previous years' question papers or sample papers is an effective strategy for CBSE Class 10 exam preparation. It helps you become familiar with the exam pattern, practice a variety of questions, assess your knowledge, manage time effectively, and build confidence. Make sure to solve these papers under exam-like conditions to get the maximum benefit.