As you are asking about the cuttoff marks of KMC mangalore,I would like to tell you that the marks doesn't remain the same each year for any medical college the marks obtained totally depends on the toughness of the paper, students appeared and many aspects so through marks we can predict any thing,but instead of it the ranks probably remains constant mostly so i recommend you to look at the cutoff ranks which i have given you below instead of looking for cutoff marks.
Categories Ranks
3A General 356+
2A General 1502+
General Merit Hyderabad 1525+
General Merit Rural 1676+
General Merit Kannada 3357+
SC 4863+
General 293+
SC Rural 12007+
3B General 772+
ST 3375+
2B General 1418+
2A Hyderabad 2787+
1 General 1342+
But for you i tell you last years cutoff marks was between 610-470