However, I can guide you on how to find the required book or similar resources.

1. Official CBSE Website:
Visit the official website of the Central Board of Secondary Education (CBSE) at www.cbse.nic.in. Look for the "Publications" or "Books" section and search for the desired book. CBSE often releases sample papers, question banks, and solved papers for various subjects, including Mathematics. You may find the required book or similar resources there.

2. EduRev:
EduRev is a popular online platform that provides study materials, sample papers, solved papers, and other educational resources. They have a wide collection of CBSE class 10 resources, including the Circle CBSE Chapterwise 10 Years Solved Papers Mathematics Class 10 (2020) book you are looking for. Visit the EduRev website at www.edurev.in and search for the specific book. You are likely to find the book in PDF format or similar resources that can help you with your preparation.

3. Local Bookstores and Libraries:
Visit local bookstores or libraries in your area that specialize in educational materials. They might have a collection of CBSE class 10 books, including the Circle CBSE Chapterwise 10 Years Solved Papers Mathematics Class 10 (2020). Inquire with the staff or check the catalog to see if they have the book available in physical or digital format.

Remember that it is important to use reliable and authentic resources for your studies. Make sure to verify the credibility of any website or platform you choose to download study materials from.

Additional Tips:
- Consider checking other online platforms, such as Amazon or Flipkart, as they may have the book or similar study materials available for purchase.
- Ask your classmates, teachers, or seniors if they have any recommended resources for CBSE class 10 Mathematics preparation.
- Utilize the previous year's question papers and sample papers provided by CBSE to practice and familiarize yourself with the exam pattern and question types.

Always prioritize your studies and consult with your teachers or mentors if you need further assistance or guidance in finding study materials.

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