Branching and Completion status

I am using Captivate 6 and have a course with 3 branches in the second slide. The course has a total of 60 pages. Each branch has 17, 15 and 26 slides respectively. How can I ensure completion status when the learners reach at the last page of any branch? Any JavaScript code to be included in 17th, 15th and 26th page of each branch?

Many thanks for your help.