Yes. Let's say you are repeating your 12th either for betterment or supplementary reasons, you are eligible for NEET. However, your admission is provisional subjective to fulfilling the eligibility criteria which is 17 years atleast by December 31st, 2020 and securing the minimum aggregate against your Category. For being eligible for NEET,you should secure a minimum aggregate of 50% in Physics, Chemistry and Biology. It is 50% for General Category, 45% for PWD and 40% for OBC,SC,ST. And with your 12th qualification, you can also study B.Sc Psychology.