For eligibility in neet the criteria for marks:The candidate must have passed in the subjects of Physics, Chemistry, Biology/Bio-technology and English individually and must have obtained a minimum of 50% marks taken together in Physics, Chemistry and Biology/ Bio-technology at the qualifying examination.In respect of candidates belonging to Scheduled Caste/Scheduled Tribes or Other Backward Classes, the marks obtained in Physics, Chemistry and Biology/Bio-technology taken together in qualifying examination be 40% instead of 50% for General Candidates.Further, for persons for locomotory disability of lower limbs, the minimum of 45% marks for General-PH and 40% marks for SC-PH/ST-PH/OBC-PH are requiredThis is regarding your 12th boards. So the 11th marks do not count for neet application form or eligibility.Coming to your question the minimum marks would be the passing marks set by your school/college to be promoted to 12thGood luck!