I have cleared my first year mbbs in second attempt

Hello,
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You haven't completed your question.
Are you asking about taking admission in AIIMS after clearing your 1st in 2nd attempt.
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If it's like that then YES you are eligible.
Don't care about in how many attempts you have cleared it just mind the thing you have cleared it with all your efforts.
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Hope this helped in clarifying your question.
Thank you