@avening-patent-dupe - it is correct, the links are broken. For the mentioned exam, I think the below will work. However, see the following note on the github page.
This course will be retiring on 2024/4/30. We are no longer monitoring this repo for Issues and Pull Requests. Once the course is retired, all GitHub repos will be removed. You can find related content in the Microsoft Fabric repo.
So I think you need to refer to the links in the mslearn-fabric collections.
https://microsoftlearning.github.io/mslearn-fabric/Instructions/Labs/02-analyze-spark.html
and you may find the full list of exercises here.
https://microsoftlearning.github.io/mslearn-fabric/
Refer to these URLs and see whether it helps.
Hope this helps