Multi-Question Quiz

This may be a silly question but I'm stumped! I recently started working in Storyline. Throughout my course I changed my work flow from having a 5 question quiz at the end of each chapter to having individually graded questions dispersed throughout, which is working great.

However, I now need to create my final exam which is going to be comprised of 25 multiple choice questions. The quiz is to be graded as a whole, not each question individually. The requirement is an overall score of at least 70% with 3 possible attempts.

I seem to figure out how to do this in Storyline. The only options I'm seeing are to have each question added and graded individually.

Any help is much appreciated! Thanks!