When you sign into Scroll Kit for the first time you will see a brief tutorial on how to use the service. As you work through the tutorial, you can delete parts of the tutorial until you have a blank canvas. On your blank canvas you can draw, add text boxes, add images, add videos, and insert app scripts. You can build multiple layers into your Scroll Kit site. When you're ready to publish your pages you can publish on a Scroll Kit subdomain for free or redirect to a domain that you own.
Applications for Education
A word of warning before you use the site, currently one of Scroll Kit's sample pages contains a word that is definitely not appropriate for school. I sent them an email and suggested a change, we'll see what happens. If they take my advice Scroll Kit could be a good tool for students to use to quickly begin experimenting with elements of design.
Update again: Thanks to Mark's comment below I learned that Scroll Kit only changed one of the sample pages not all of them. Sorry :(