There are several online quizzes and mock tests available for the UPSC Medical Science Optional subject. These resources can be very helpful for candidates preparing for the UPSC examination as they provide an opportunity to practice and assess their knowledge and understanding of the subject. Here are some details about the availability of online quizzes and mock tests for UPSC Medical Science Optional subject:

1. EduRev:
- EduRev is a popular online platform that offers a wide range of study materials, quizzes, and mock tests for various competitive exams, including UPSC.
- They have a dedicated section for UPSC Medical Science Optional subject, where you can find numerous quizzes and mock tests to practice.
- The quizzes and mock tests on EduRev are designed by subject matter experts and cover the entire syllabus of the Medical Science Optional subject.
- These tests provide a comprehensive analysis of your performance, highlighting your strengths and weaknesses, and helping you identify areas that need improvement.

2. Features of EduRev quizzes and mock tests:
- EduRev quizzes and mock tests are designed to replicate the real UPSC examination environment, ensuring that you are well-prepared and familiar with the format.
- They cover a wide range of topics within the Medical Science Optional subject, including Anatomy, Physiology, Pharmacology, Pathology, Microbiology, and more.
- The questions in these tests are based on the latest UPSC syllabus and previous year question papers, ensuring that you are well-prepared for the actual exam.
- The tests come with detailed solutions and explanations, allowing you to understand the concepts and learn from your mistakes.

3. Benefits of using online quizzes and mock tests:
- Online quizzes and mock tests provide a realistic exam experience, helping you understand the format, time management, and exam pressure.
- They help you identify your strengths and weaknesses, allowing you to focus on areas that require more attention.
- Regular practice with quizzes and mock tests improves your speed and accuracy in answering questions, thereby enhancing your overall performance in the exam.
- These resources provide an excellent opportunity to assess your progress and make necessary improvements before the actual UPSC examination.

In conclusion, online quizzes and mock tests are valuable resources for UPSC Medical Science Optional subject preparation. EduRev is a reliable platform that offers a wide range of quizzes and mock tests designed specifically for UPSC aspirants. Utilizing these resources can greatly contribute to your success in the UPSC examination.