(http://csharppad.com/gist/c41b56aa4acb366b74de4d0618df8dae)

file.cs

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    public GameObject[] Pages;
    private int index;

    public void Button_NextPage()
    {
        if (index == Pages.Length - 1) return;
        index++;
        for (int i = 0; i < Pages.Length; i++)
            if (index == i)
                Pages[i].SetActive(true);
            else
                Pages[i].SetActive(false);
    }
    public void Button_PrevPage()
    {
        if (index == 0) return;
        index--;
        for (int i = 0; i < Pages.Length; i++)
            if (index == i)
                Pages[i].SetActive(true);
            else
                Pages[i].SetActive(false);
    }