Can I do two Singleton Pattern Design scripts in my scene Unity C#

I want to know is it possible to have two singleton pattern design scripts . I tried to fix the problem by making making functions public . The script I have is not access the MyclockScript . I got one error and its saying Game.cs(6,9): error CS0246: The type or namespace name `myclock’ could not be found. Are you missing a using directive or an assembly reference? I don;t know what to do at this point

using UnityEngine;
using System.Collections;
using UnityEngine.SceneManagement;
public class Game : MonoBehaviour {

private myclock MyClockScript;
void Start () {
myClock = GetComponent();
}

// Update is called once per frame
void Update () {
 if (myClock.m_leftTime <= 0 || GameManagerSingleton.instance.score > 50)
       {
           SceneManager.LoadScene("I");
       }
}

}

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
public class MyClock : MonoBehaviour
{
public int Minutes = 0;
public int Seconds = 0;

  private Text    m_text;
  public float   m_leftTime;

  private void Awake()
  {
      m_text = GetComponent<Text>();
      m_leftTime = GetInitialTime();
  }

  public void Update()
  {
      if (m_leftTime > 0f)
      {
          //  Update countdown clock
          m_leftTime -= Time.deltaTime;
          Minutes = GetLeftMinutes();
          Seconds = GetLeftSeconds();

          //  Show current clock
          if (m_leftTime > 0f)
          {
              m_text.text = "Time : " + Minutes + ":" + Seconds.ToString("00");
          }
          else
          {
              //  The countdown clock has finished
              m_text.text = "Time : 0:00";
          }
      }
  }

  private float GetInitialTime()
  {
      return Minutes * 60f + Seconds;
  }

  private int GetLeftMinutes()
  {
      return Mathf.FloorToInt(m_leftTime / 60f);
  }

  private int GetLeftSeconds()
  {
      return Mathf.FloorToInt(m_leftTime % 60f);
  }

}

A couple of things:

In the first Game class, member variable should be private MyClock myclock; since the name of the second referenced class is MyClock.

If indeed you want the class named MyClockScript, then the member in Game class should be private MyClockScript myclock; and rename the second class to MyClockScript.