Time Score?

Okay, this is the only thing that is hindering the completion of my game. I have a timer script:

 #pragma strict
 private var startTime : float;
 var textTime : String;
 //First define two variables. One private and one public variable. Set the first variable to be a float. 
 //Use for textTime a string. 
 function Start() {
 startTime = Time.time;
 }
 function OnGUI () {
 var guiTime = Time.time - startTime; 
 //The gui-Time is the difference between the actual time and the start time.
 var minutes : int = guiTime / 60; //Divide the guiTime by sixty to get the minutes.
 var seconds : int = guiTime % 60;//Use the euclidean division for the seconds.
 var fraction : int = (guiTime * 100) % 100;
  
  textTime = String.Format ("{0:00}:{1:00}:{2:00}", minutes, seconds, fraction); 
 //text.Time is the time that will be displayed.
  GetComponent(GUIText).text = textTime; 
 }
  
 var bestScore = 0;
 var playerTime = 0;
 //When the race is completed;
 bestScore = playerTime;
 //Reset playerTime to zero
 //Display the best score(Score to beat)
 //If the next drivers playerTime is higher than the previous bestScore
 if(playerTime > bestScore){
   //Display the new best score.
  //Reset playerTime to zero
 }

The player's job in my game is to tap each of the spawning stars to destroy them, and if they let one pass a certain point they lose the game. The Timer is there to basically see how long each player can last.

I've tried, but I cannot seem to save the timer score and display on the GameOver Scene. How do I go about this? Could you please explain in a step by step way.