Written assessment for candidates with "Atlassian administration-related" questions

[Dimitrios DANAMPASIS]

I am working on a written assessment that will be shared with potential candidates. The new person will join a team responsible for:

• the migration of the Atlassian instances from Server to Cloud (Jira, Confluence, and Bitbucket)
• Atlassian product/site administration
• end-user support
• Jira project administration

I am curious to see what materials you are using or if you just write these questions/topics based on your experience. 

Do you have any recommendations on this?

Is it possible to find previous exams from Atlassian Certification examinations such as Jira Administration for Cloud (ACP-120), Managing Jira Service Projects (ACP-420), and Managing Jira Projects (ACP-610 and ACP-620)?

Thanks in advance,

Dimitris