Preparing for practical exams in CBSE Class 10 science requires a systematic approach and thorough understanding of the concepts. Here are some steps you can follow to excel in your practical exams:

1. Familiarize yourself with the Syllabus
- Go through the CBSE Class 10 science syllabus and understand the topics that are included in the practical exams.
- Make a list of all the experiments and activities that you need to be prepared for.

2. Understand the Concepts
- Read the theory associated with each experiment and activity in your textbook.
- Make sure you understand the underlying concepts and principles.
- Pay attention to the procedure, precautions, and observations mentioned in the textbook.

3. Practice the Experiments
- Set up a small laboratory at home or utilize your school's laboratory during practical sessions.
- Practice each experiment multiple times to get hands-on experience.
- Follow the correct procedure and record your observations accurately.
- Understand the importance of each step and how it contributes to the overall experiment.

4. Revise the Practical Record Book
- Your practical record book should be well-organized and neatly written.
- Revise all the experiments and activities mentioned in the record book.
- Understand the purpose of each experiment and the concepts it demonstrates.
- Make sure you can explain the procedure, observations, and inferences.

5. Review Viva Questions
- Viva voce is an essential part of practical exams.
- Review the viva questions related to each experiment and activity.
- Practice answering these questions confidently and succinctly.
- Understand the theory behind the questions and provide logical explanations.

6. Take Mock Tests
- Practice mock tests to assess your preparation level.
- Time yourself while performing experiments and answering viva questions.
- Analyze your performance and identify areas where you need improvement.
- Work on your time management skills and accuracy.

7. Seek Guidance
- If you have any doubts or need clarification, seek guidance from your science teacher or classmates.
- Discuss the experiments and activities with your peers to gain different perspectives.
- Participate in group study sessions to enhance your understanding of the concepts.

8. Stay Calm and Confident
- On the day of the practical exams, stay calm and composed.
- Be confident in your knowledge and abilities.
- Follow the instructions given by the examiner carefully.
- Focus on each experiment and activity, and give your best effort.

By following these steps and putting in consistent effort, you can effectively prepare for the practical exams in CBSE Class 10 science and achieve good results. Remember to stay organized, understand the concepts, and practice regularly to excel in your practical exams.