Best Study Materials for the Mechanics section of the UPSC Mathematics Optional subject exam:

1. Recommended Books:
- "Mechanics" by Keith R. Symon: This book provides a comprehensive coverage of mechanics, including both theoretical concepts and problem-solving techniques. It is highly recommended for UPSC Mathematics Optional exam preparation.
- "Classical Mechanics" by Herbert Goldstein: This book is a classic in the field of mechanics and offers a detailed and rigorous treatment of the subject. It covers a wide range of topics and is suitable for advanced learners.
- "Introduction to Classical Mechanics" by David Morin: This book is known for its clear explanations and problem-solving approach. It covers the fundamentals of mechanics in a concise and engaging manner.

2. Previous Years' Question Papers:
- Solving previous years' question papers is crucial for understanding the exam pattern and gaining familiarity with the types of questions asked. It helps in identifying the important topics and practicing time management.

3. Online Study Platforms:
- EduRev: EduRev is a comprehensive online platform that provides study materials, notes, practice questions, and mock tests for various competitive exams, including the UPSC Mathematics Optional subject exam. It offers a vast collection of resources for the mechanics section, including video lectures, study notes, and practice questions.

4. Video Lectures:
- Video lectures can be a great supplement to traditional study materials. They provide visual explanations and examples, making it easier to understand complex concepts. Platforms like EduRev offer video lectures specifically designed for the UPSC Mathematics Optional exam, covering the mechanics section in detail.

5. Study Guides and Notes:
- Study guides and notes curated by experts can provide concise summaries of the important topics in mechanics. These materials often include key formulas, definitions, and solved examples, making them useful for quick revision.

6. Joining Coaching Institutes:
- Joining a coaching institute that specializes in UPSC Mathematics Optional exam preparation can provide structured guidance and access to experienced faculty. They offer comprehensive study materials, regular mock tests, and personalized feedback to help students excel in the mechanics section.

It is important to note that while these study materials are highly recommended, students should also focus on understanding the underlying concepts and practicing problem-solving techniques. Regular revision, self-assessment, and solving a variety of problems from different sources are essential for success in the mechanics section of the UPSC Mathematics Optional exam.