How to select different objects with raycast (puzzle game)

Hi everyone, I was making a memory puzzle game with 9 cards, the goal is match 3 cards with other cards with the same picture until the 9 cards find his matches(something like this match game). I want to select one of the cards when I click over the object, the problem is when I click any card, only one card is selected and flip and is always the same card,even if I hit different cards. All cards are the same, just with different picture and all have the same tag. How can I fix it? Sorry for my english.

 using UnityEngine;
 using System.Collections;
 
 public class GameController_script : MonoBehaviour {
 
     public bool win;
     public int cardValue = 0;
     public string cardName;
     public float rotateDegreeSecond = 180.0f;
     public bool isFaceUp = false;
     public float flip_degree_limit = 180.0f;
     public Camera myCam;
 
     private controller_script control;
 
     void Start () 
     {
         //control = GameObject.FindWithTag("Card").GetComponent<controller_script>();
     }
     
 
     void Update ()
     {
 
         if (Input.GetMouseButton(0))
         {
             clickObject();      
         }
 
     }
 
 
     void clickObject()
     {
             control = GameObject.FindWithTag("Card").GetComponent<controller_script>();
             RaycastHit hit;
             Ray ray = myCam.ScreenPointToRay(Input.mousePosition);
             Debug.DrawRay(ray.origin, ray.direction * 10, Color.yellow);
            
             if (Physics.Raycast(ray, out hit))
             {
                if (hit.collider.tag == "Card")
                {
                     control.activeFlip(); //this make the cards flip, no problem with this              
                }
             }
 
             
 
     }
 
 }