Amy Potter and Della Robertson
Just like with everything in ArcGIS, there seems to be more than one way to do something.
I imagine that student will be using a variety of different layers from different sources (some they create others from authoritative sources). I think having them add all their content into one map could be a bit cumbersome at the end. But it is possible. They would just have to open the same map at different times, add their layers and save a bookmark or add a slide to the presentation. But this method leaves the possibility for many errors and will be more cumbersome.
Another option is to have each student create their own map in their own individual account. Their final maps (or apps) can then be shared to a group that is to be for only final products. All students will have access to this group. Then from this group, you can create a Gallery in which someone can view all the maps from a single location. This isn't one map, but rather a collection of maps. From within a Group, click "Share" and create an WebApp. You can select from the Map Carousel, Maps and Apps Gallery, or Public Gallery. At the end when students are ready to present, they just click on their map and go.
Hope this helps,
Amy
