Generally, medical colleges accept two mark sheets (CBSE and NIOS) if you failed a subject like Chemistry in CBSE but cleared it through NIOS, making you eligible for NEET and subsequent admissions, according to NMC guidelines.

Ensure that, combining both mark sheets, you have passed Physics, Chemistry, Biology/Biotechnology, and English as core subjects, meeting the minimum aggregate percentage (e.g., 50% for General, 40% for SC/ST/OBC).

However, it's always recommended to confirm specific college requirements and NEET guidelines to avoid any potential issues during counseling or admission process. You should be prepared to present both marksheets and, if necessary, explain the situation during the admission process.