How much cut off usually rise in obc- ph to get admission for mbbs in NEET.....

The cutoff for OBC pH may go very low and we usually be between 300 to 350 as well for decent college but is difficult to predict since it will depend much on the quality of the question paper and relative performance of the different candidates but never the less as compared to the unreserved category is which have higher cutoff for good colleges and the qualification criteria coming to as low as 120 out of 720 around last year and for the reserved candidates it being around 95 out of 720 these are no figures which will get into a collage of your expectations
foreign reserve candidate I would have asked to target in excess of 500 for getting a state quota seat by 85% and in excess of 550 for and all India quota seat by 15% but since you are applying OBC and pH quota the cut offs may be 420 and 470 respectively for the 85% and 15% quota reservations
yet it will always be better if you could keep your hope Sabbath hai and keep your target sai is well because you never know when there is a deep in the marks or a sudden rise in the ranks of the relative performance of other candidates which might make you falta with the cut offs as stated above and thus try to score has highest possible according to my guidance