Could be done with advanced actions on entering the content slides. You didn't tell which version you are using? There is a system variable cpQuizInfoAttempts that will change from the starting value 0 to 1 when the first attempt starts, to 2 for the second etc.
So the On Enter action for content slides will check if cpQuizInfoAttempts is greater than 1, if Yes you send the user to the next slide, if No just Continue. It is the same action for all content slides, and you can apply it to all of them at once, after selecting them in the filmslide.
Lilybiri