The Case Studies on the Outreach portal need additional examples from around the world. See page here: https://outreach.wikimedia.org/wiki/Education/Case_Studies. The list now is far from comprehensive and certainly not up-to-date.
If you'd like to add a case study, please create a subtask of this task and describe the kind of case study you are planning to add. Think about including examples from assignments tasks that are not related to Wikipedia, but its sister projects - i.e. assignments that involve Commons, Wikisource, Wiktionary, Wikibooks, Wikispecies etc.
The page would also benefit from creating sub paragraphs according to age groups, and a listing of types of assignments relevant for each group.