Нужно сделать функцию для проверки теста

from tkinter import *
 
 
def clicked():
    if IntVar == 1:
        lbl.configure(text = "Good")
    else:
        lbl.configure(text = "BAD")
    btn.destroy()
 
 
 
window = Tk()
window.title("Тест з інформатики")
window.geometry ('500x500')
window['bg'] = "#00FFFF"
 
lbl1 = Label(window, text="Тест з інформатики", font=(30), fg="#7CFC00", bg="#FF0000", justify=CENTER)  
lbl1.pack()
 
lbl2 = Label(window, text="1. Виберіть пристрій введення інформації", font=(30), fg="#7CFC00", bg="#FF0000", justify = RIGHT)  
lbl2.pack()
 
 
 
 
 
chk1_state = BooleanVar()  
chk1_state.set(0)  
chk1 = Checkbutton(window, text='Принтер', var=chk1_state, fg="#000080", bg="#B0E0E6", justify=RIGHT)  
chk1.pack()  
 
chk2_state = BooleanVar()  
chk2_state.set(0)  
chk2 = Checkbutton(window, text='Сканер', var=chk2_state, fg="#000080", bg="#B0E0E6", justify=RIGHT)  
chk2.pack()  
 
chk3_state = BooleanVar()  
chk3_state.set(0)  
chk3 = Checkbutton(window, text='Монітор', var=chk3_state, fg="#000080", bg="#B0E0E6", justify=RIGHT)  
chk3.pack()  
 
chk4_state = IntVar()  
chk4_state.set(1)  
chk4 = Checkbutton(window, text='Клавіатура', var=chk4_state, fg="#000080", bg="#B0E0E6", justify=RIGHT)  
chk4.pack()  
 
 
lbl = Label(window, text="")
lbl.pack()
 
btn = Button(window, text = "Відповідь", fg="#7CFC00", bg="#FF0000", font =30, command=clicked)
btn.pack()
 
 
window.mainloop()