Relying solely on 10 class past papers for your exam preparation may not be the best approach. While past papers are undoubtedly a valuable resource for understanding the exam format, question patterns and testing your knowledge, they should be part of a more comprehensive study plan. Here are a few reasons why you should not solely rely on 10th-grade past papers for exam preparation:

1. Curriculum Differences: The curriculum and subject matter for the 10th grade are different from what you will encounter in the 11th grade. You need to study new topics and concepts that won't be covered in your 10th-grade past papers.

2. Depth of Knowledge: As you progress to higher grades, the level of difficulty and depth of knowledge required for exams typically increases. Relying solely on 10th-grade past papers may not adequately prepare you for the higher-level content in the 11th grade.

3. Subject Variation: Different subjects have their unique demands. Relying solely on past papers for one subject may neglect others where you need more practice and understanding.

4. Changing Exam Structures: Exam Structures can change from year to year. What was relevant in previous years may not be entirely applicable to the current year's exams. Using only 10th-grade past papers may not reflect these changes.

5. Limited Exposure: By solely relying on past papers, you miss out on the opportunity to explore a wider range of study materials, textbooks, and resources that can help you gain a more comprehensive understanding of the topic.

So, while 10 class past papers can be a useful part of your preparation, it's essential to supplement them with current study materials, guidance from teachers, and a thorough understanding of the 11th-grade curriculum. A well-rounded approach to exam preparation is more likely to lead to success.