sir,

how much marks should we score minimum, to get a mbbs seat through neet?

@ muthu 
that depend upon the difficulty level of the paper and as per the current year NEET phase 2 is yet to be conducted , its very difficult to say that the minimum cutoff for a govt mbbs seat . 
u can easily get a private medical college seat by scoring 200-300 but for getting a govt seat u need to scoree more than 480 at least , 
if u can score more than 480 then u are on the safe side , still we cannot say its enough for getting a seat , that depend upon how others performed in the exam and your ranks in NEET . 
ALL THE BEST ..