I\'m a high school teacher in L.A. trying to create a course registration system using Apps Script. I need the Google Form I\'m using for this registration to:
Ques
You are not able to create this type of dynamic form using the Google Forms Service, because there is no interaction between the service and scripts during form entry, except upon Form Submission. In the case of a multi-page form, a script has no way to know that a student has completed one page and gone on to another.
You could achieve this using the HtmlService or UiService, though. In either case, you'd rely on the client-side form interacting through server-side scripts to get updated lists of course options, then modifying the next 'page'. It will be complex.