According to the official brochure available at: https://www.afmc.nic.in/ADVT/G3InfoBrochureAFMCMBBS2020.pdf, Candidates shoulD pass their 12th in their first attempt. So if you have passed your 12th in the first attempt but appeared for Improvement exams to improve your percentage, you are eligible for AFMC admission process. But if you are appearing for improvement exams because you have failed in any of the subjects, then you are not eligible for admission to AFMC.
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