How to save variables from a game in a folder?

问题

I created a game and now I am doing a GUI (with the UI) for that game. In this GUI I have an Inputfield named "SubjectID", where the player can write his name in there. My aim would be that for each of the players there would be like a folder with his variables (performance and points). How can I do this?

Here the code I have for my Inputfield of the SubjectID:

public void Start() {


    //Inputfield for SubjectID
    inputFieldSIDCo = GameObject.Find ("Subject").GetComponent<InputField> (); 

    InputFieldSI =  new InputField.SubmitEvent();

    InputFieldSI.AddListener (SubmitSubjectID);

    inputFieldSIDCo.onEndEdit = InputFieldSI; 
}

//function which submits Inputfield SubjectID 
public void SubmitSubjectID(string arg1) {

    //save arg1 in a variable called SUBJECTID (with string characteristics) 
    SUBJECTID = arg1; 
    //Debug.Log (SUBJECTID); 


}