hi,

see there is no age limit to appear in neet ug exam, and if you do not have biology in 12th course you may take nios exams and nios certificate is accepted by all government and private organization in india, now if you cleared the compartment paper before the admission of neet ug then it is acceptable. the qualifying marks criteria for neet ug is 50% aggregate of pcb for general category students, 40% aggregate marks of pcb applicable for sc/st/obc candidates.