Hey all,
I've just passed the Professional Scrum Developer 1 exam, and from reading the follow up email sent to me, the area I fell down in the most was the "Documentation / Persistence - Documentation makes information persistent. Documentation is incrementally maintained, and is a development activity." topic. I was a little surprised to see this topic feature in the exam, because during my prep study I didn't really see much focus on documentation in any websites/mock exams/documentation I read.