For "CC Image Wipe" Completion:
stop=thisComp.layer("STOP").index;
start=thisComp.layer("START").index;
n=stop-start-1;
thisComp.layer("CONTROLLER").effect("CC Image Wipe")("Completion")+(100-thisComp.layer("CONTROLLER").effect("CC Image Wipe")("Completion"))/n*(1+n-(index-start));

For Position:
stop=thisComp.layer("STOP").index;
start=thisComp.layer("START").index;
n=stop-start-1;
transform.position+thisComp.layer("CONTROLLER").effect("Point Control")("Point")/n*(1+n-(index-start));
