Yes, there are mock tests available for practicing UPSC Mathematics Optional differential geometry questions. These mock tests can help you in preparing for the UPSC Mathematics Optional examination by providing you with an opportunity to practice a variety of differential geometry questions in a simulated exam environment. Here are some details about these mock tests:

1. EduRev:
- EduRev is an online learning platform that provides a wide range of educational resources for various competitive examinations, including UPSC.
- They offer mock tests specifically designed for UPSC Mathematics Optional examination, which includes differential geometry questions.
- These mock tests are created by experienced educators and experts in the field of mathematics.
- The questions in these mock tests are based on the UPSC syllabus and are similar in difficulty level to the actual examination.
- The tests are available online, and you can access them anytime and anywhere according to your convenience.
- EduRev also provides detailed solutions and explanations for the questions, which can help you understand the concepts and techniques used in solving differential geometry problems.

Benefits of Practicing Mock Tests:
- Practicing mock tests can help you familiarize yourself with the exam pattern, time management, and question types of the UPSC Mathematics Optional examination.
- It allows you to assess your strengths and weaknesses in differential geometry and identify areas where you need improvement.
- Regularly practicing mock tests can help you build confidence and reduce exam-related stress.
- It helps in improving your problem-solving skills and enhances your understanding of differential geometry concepts.
- By analyzing the solutions and explanations provided in the mock tests, you can learn new approaches and techniques to solve differential geometry problems efficiently.

Conclusion:
Mock tests are an essential tool for UPSC Mathematics Optional aspirants preparing for differential geometry questions. They provide a realistic exam experience and help in improving problem-solving skills. EduRev offers a platform for practicing mock tests specifically designed for UPSC Mathematics Optional examination. Regularly practicing these mock tests can significantly contribute to your preparation and increase your chances of success in the UPSC Mathematics Optional examination.