Maine 12 comm se comp ki hai to meine UP board se per leke dobara 12 PCB se karra hu to kya mein neet pass karke mbbs mein add le sakta hu.
U can do this and believe me it's never too late to follow your dreams .
You just have to pass 12th a minimum of 50% marks in physics chemistry and biology individually if u are from general category .
45% if obc
40% if sc /st
All that matters is your marks in the final boards with which you will be applying for the meet exams . I don't think that the previous board's marks will be taken into consideration once you have new report card.