According to previous years cut off marks vs rank analysis your rank will lie between 21338 - 29229, bds state quota cut off for kmc goes around 522 against a rank of 14068 from general category so you have no-meagre chances of getting bds at kmc from state quota but nothing can be said as previous years cut off change every year depend upon level of difficulty of paper that year no of candidates applying etc so nothing can be predicted with 100% clarity especially if you are on borderline of getting/not getting a seat (as you have scored 500, 522 was cut off last year you might get if cut off goes down to 500 and you might not get if it does not)