I recently took the IPMA (International Project Management Assoociation) Level D exam. If focuses - and in my understanding, this is the key difference from other project management exams - not on project management itself, but rather on competencies a project manager should have. Naturally, these include compentencies more closely related to project management (aligning a project with the orgnizations goals, ...), but also more general competencies like communication, conflicht management, self-organization, etc. Some of the advice was surprisingly hands-on (e.g. when to tell jokes!).

Anyway, my suggestion is to have a look at the syllabus [1] and see if there are topics of interest to you. If yes, I'm not necessarily advocating to take the exam, but rather to read the study materials (they include suggestions for further reading as well).

[1] https://www.apm.org.uk/v2/media/1qedrjtq/ipmasyll-leveldcert...