Hello

yes, you can definitely apply for Olympiad exams even if you're repeating your 12th from NIOS.

Olympiad exams are generally open to students who are currently enrolled in a recognized educational institution. Since NIOS is a recognized national board, you are eligible to participate.

However, it's important to check the specific eligibility criteria for each Olympiad you're interested in. Some Olympiads may have additional requirements, such as a minimum percentage in certain subjects or a recommendation from a teacher.

Here are some popular Olympiads you can consider:

• National Science Olympiad (NSO)
• National Mathematics Olympiad (NMO)
• International Biology Olympiad (IBO)
• International Chemistry Olympiad (ICHO)
• International Physics Olympiad (IPhO)
• International Informatics Olympiad (IIO)

Remember to check the official websites of these Olympiads for the latest eligibility criteria and application deadlines.