Please help me with my unity puzzle game scripts

I have seperate script

Puzzle script: which working properly

Score: which is my problem. its not generating score.

LevelComplete: My main problem

Im having problem with running it correctly

heres my score script:

 static var Score : int;
 var Buttonskin : GUISkin;
 
 function OnGUI()
 {
 GUI.skin = Buttonskin;
 GUI.Box(Rect(150,60,100,50),"");
 GUI.Label(new Rect(160,73,100,50),"Score :" + Score);
 }
 
 

please correct it if theres something wrong

heres my LevelComplete Script:

 var shoF : boolean;
 var Buttonskin : GUISkin;
 
 function OnGUI(){
 GUI.skin = Buttonskin;
 if(1.o11 == 1 && 2.o11 == 1 && 3.o11 == 1 && 4.o11 == 1 && 5.o11 == 1 && 6.o11 == 1 && 7.o11 == 1 && 8.o11 == 1 && 9.o11 == 1 && 10.o11 == 1 && 11.o11 == 1 && 12.o11 == 1 && 13.o11 == 1 && 14.o11 == 1 && 15.o11 == 1 && 16.o11 == 1){
 
 
 if(GUI.Button(new Rect(400,100,200,50),"Level Complete")){
 
 Application.LoadLevel("NextPuzzle");
 }
 }
 }
 

I have named all my tile in the hierarchy:

its a 16 tile image puzzle

1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,Slot(for the empty slot)

i have also created a script in each tile that will access my Score script:

here's one of the script:

 static var o11 : int;
 
 
 function OnTriggerEnter(other : Collider) {
   if(other.gameObject.tag == "15"){
     Score.Score += 100;
     o11 += 1;
     }
     }
 function OnTriggerExit(other : Collider) {
   if(other.gameObject.tag == "15"){
   Score.Score -= 100;
   o11 -= 1;
     }
     }
 

Please help me!!! I'm sorry for my lack of knowledge Thank you!!