How to call a function in another script

i have script that adds score on tap of the object, but the score gets deleted after the object does. so i would like to Know how to call a function on another script, in order to update the score, and record the score on a guitext.

here is my code

 var Score : int;
  
  function Save() {
      if (PlayerPrefs.HasKey("Highscore")) {
          if (PlayerPrefs.GetInt("Highscore") < Score) {
              PlayerPrefs.SetInt("Highscore", Score);
          }
      } else {
          PlayerPrefs.SetInt("Highscore", Score);
      }
      PlayerPrefs.Save();
  }
  
  function Load() {
      if (PlayerPrefs.HasKey("Highscore")) {
          Score = PlayerPrefs.GetInt("Highscore");
      }
  }function Update () {
        for(var i:int = 0; i < Input.touches.Length; i++)//How many touches do we have?
      {
          var touch:Touch = Input.touches[i];//The touch
          var ray:Ray = Camera.main.ScreenPointToRay(touch.position);
          var hit:RaycastHit = new RaycastHit();
  
          if(Physics.Raycast(ray,hit, 1000))
          {
              if(hit.collider.gameObject == this.gameObject)
              {
                  switch(touch.phase)
                  {
                     
                       case TouchPhase.Began://if the touch begins
                        DestroyObject(gameObject);
                        Score++;
                       break;
                     
                   }
              }
           }
  
          }
  
  }

thanks in advance :)