In processing, a index mark or indextrack is an actual impression made on a hard plate drive. Its motivation is to show the beginning stage for each track on the hard plate drive. Typically, a index mark appears as an opening, hole, or attractive strip. For computing index mark at mg, you need to initially take the amount of your imprints in 4 subjects. (Not english and second language). You will get 50 imprint each as weightage for your 3 discretionary subjects in addition to 15 imprints for ncc/nss/ex-servicemen. Amount of this large number of gives your file marks.