Health change than object health is not decreasing ?

Hi,I’m creating a survival shooter game.I have 3 script target,gun and score board.I’m trying to do score = 10 change health 60 or + 10 but changed moment object is health is not decreasing,pls help.

    public float damage = 5f;
    public float range = 100f;
    public float fireRate = 15f;

    public Camera fpsCam;
    public ParticleSystem Muzzle;

    public void Button_Click ()
    {
        if (Input.GetButton("Fire1"))
        {
            Shoot();
        }
	}

    public void OnPointerDown()
    {
        InvokeRepeating("Shoot", 0, 0.2f);
    }
    public void OnPointerUp()
    {
        CancelInvoke("Shoot");
    }



    void Shoot ()
    {
        Muzzle.GetComponent<ParticleSystem>().Play();

        RaycastHit hit;
        if(Physics.Raycast(fpsCam.transform.position, fpsCam.transform.forward, out hit, range))
        {
            Debug.Log(hit.transform.name);

            Target target = hit.transform.GetComponent<Target>();
            if(target != null)
            {
                target.TakeDamage(damage);
            }
        }
	}

and

    public float health;

    public void Update()
    {
        if (ScoreScript.scoreValue == 10)
        {
            health = 60f;
        }
    }

    public void TakeDamage (float amount)
    {
        health -= amount;
        if(health <= 0f)
        {
            ScoreScript.scoreValue += 10;
            Die();
        }
    }

    void Die()
    {
        Destroy(gameObject);
    }
}

The void Button_Click() is never called in the script, and hence does nothing.
You have to call it in Update() for the Input.GetButtonDown to be checked on every frame.

public void Update()
{
if (ScoreScript.scoreValue == 10)
{
health = 60f;
}
}

It seems to me that this is your problem. You keep setting health = 60 in every frame. You need to have a way to turn this off once it fires, if I understood your problem correctly.