Make a variable to check for correct answers and that incorrect are unselected.
In the checkbox CL:
check= this.isSelected(1) and this.isSelected(3) and this.isSelected(5)
and not( this.isSelected(2) or this.isSelected(4) )
You can then use checkboxName.script.check
as a condition for note content:
content: when checkboxName.script.check "Correct"
otherwise "Incorrect"
Many people want to wait for submission:
content: when checkboxName.submitted
#or button.pressCount>0 if there's no submit
(when checkboxName.script.check "Correct"
otherwise "Incorrect")
otherwise "Instructions"