Eligibility Criteria for UPSC Law Optional Subject Exam:

To appear for the UPSC Law Optional Subject Exam, candidates must fulfill certain eligibility criteria. These criteria include age limit, educational qualification, and nationality. Let's discuss each criterion in detail:

Age Limit:
- The candidate must be at least 21 years old.
- There is no upper age limit for appearing in the UPSC Law Optional Subject Exam.

Educational Qualification:
- The candidate must hold a degree in Law from a recognized university.
- Candidates who have appeared for the final year of their Law degree and are awaiting results are also eligible to apply for the exam.
- Candidates who have passed the final examination of the Institute of Chartered Accountants of India/Institute of Cost & Works Accountants of India/Company Secretaries of India are also eligible, provided they have completed their graduation in Law and have secured at least 55% marks in aggregate.

Nationality:
- The candidate must be either:
- A citizen of India, or
- A subject of Nepal or Bhutan, or
- A Tibetan refugee who came over to India before January 1, 1962, with the intention of permanently settling in India, or
- A person of Indian origin who has migrated from Pakistan, Burma, Sri Lanka, East African countries of Kenya, Uganda, the United Republic of Tanzania, Zambia, Malawi, Zaire, Ethiopia, or Vietnam with the intention of permanently settling in India.

Conclusion:
To summarize, candidates who meet the age limit, possess a degree in Law from a recognized university, and fulfill the nationality criteria are eligible to appear for the UPSC Law Optional Subject Exam. It is important to carefully review the eligibility criteria before applying for the exam to ensure compliance with the requirements.