Dimensions of BorderLayout zones

I have a problem in the interface that I am developing. I have 4 panels (Oest, Center, East and South) inside another panel, the problem is that I want to modify the size of the center panel since it is too big and this decreases the size of the right panel. How do I do it?

Central panel code (constructor):

public InformationStudentLabel ()     {

    TitledBorder borde = (new TitledBorder("Centro"));
    setBorder(borde);



    setLayout (new GridLayout (7,1));


    codigo = new JLabel ("Código:");
    nombres = new JLabel ("Nombres:");
    apellidos = new JLabel ("Apellidos:");
    semestreIngreso= new JLabel ("Semestre de ingreso:");
    facultad = new JLabel ("Facultad:");
    promedio = new JLabel ("Promedio:");
    intercambio = new JLabel ("Intercambio:");



    add(codigo);
    add(nombres);
    add(apellidos);
    add(semestreIngreso);
    add(facultad);
    add(promedio);
    add(intercambio);
}

right panel code (constructor):

public Student Information ()     {

    TitledBorder borde = (new TitledBorder("Derecha"));
    setBorder(borde);

    setLayout (new GridLayout (8,1));

    codigoT = new JTextField ("");
    codigoT.setEditable(false);


    nombresT = new JTextField ("");
    nombresT.setEditable(false);

    apellidosT = new JTextField ("");
    apellidosT.setEditable(false);

    semestreIngresoT = new JTextField ("");
    semestreIngresoT.setEditable(false);

    facultadT = new JTextField ("");
    facultadT.setEditable(false);

    promedioT = new JTextField ("");
    promedioT.setEditable(false);

    intercambioT = new JCheckBox ();


    cambiarPromedio = new JButton ("Cambiar Promedio");



    add(codigoT);

    add(nombresT);

    add(apellidosT);

    add(semestreIngresoT);

    add(facultadT);

    add(promedioT);

    add(intercambioT);


    add(cambiarPromedio);

}

Code of the panel that inherits the previous 2 (constructor):

Public Body ()     {

    setLayout(new BorderLayout ());




    TitledBorder borde = BorderFactory.createTitledBorder("Información estudiante");
    borde.setTitleColor(Color.black);
    setBorder(borde);

    imagen = new ImgEstudiante ();
    add (imagen, BorderLayout.WEST);

    informacionEstudianteLabel = new InformacionEstudianteLabel();
    add(informacionEstudianteLabel, BorderLayout.CENTER);

    informacionEstudiante = new InformacionEstudiante ();
    add (informacionEstudiante, BorderLayout.EAST);




    navegacion = new Navegacion();
    add(navegacion, BorderLayout.SOUTH);





}