Multiple Choice Quiz Score

Create an actions layer that extends the full length of the timeline and in frame 1 create a score variable.  As you go along with the quiz, add/subtract value to that variable for right/wrong answers.  As long as that layer extends to the end, that variable is accessible to be changed, and at the end will equal whatever value it has accrued.

That code will only have a chance of working if you are publishing for AS2.  In the first frame you want to declare the variable... there should be no need for any _root (AS2) reference...

1st frame:   var total:Number = 0;

subsequent frames....  total += 1   or    total -= 1 // add 1 or subtract 1

note: total += 1  is the same as:  total = total + 1    (similar for -= )

Create a textfield, give it an instance name, and assign the score to it as its text property...

yourTextField.text = String(score);