The topics that the chapters and sections have covered haven't been randomly chosen, as the Salesforce Advanced Administrator certification guide clearly states what is covered in the exam and what percentage of questions will cover that topic (as of Winter '20):
- Security and Access: 20%
- Extending Custom Objects and Applications: 8%
- Auditing and Monitoring: 6%
- Sales Cloud Applications: 10%
- Service Cloud Applications: 10%
- Data Management: 10%
- Content Management: 3%
- Change Management: 10%
- Analytics, Reports, and Dashboards: 10%
- Process Automation: 13%
We have probably covered more than what's strictly necessary for the exam, but more is better when dealing with knowledge.
Given that each exam session contains 60 questions (optional 5 more questions may be added by Salesforce to the exam for internal checks, but they are not scored; unfortunately, you don't know which questions those are), you get the following average number of questions per topic:
- Security and Access: 12
- Extending Custom Objects and Applications: 4-5
- Auditing and Monitoring: 3-4
- Sales Cloud Applications: 6
- Service Cloud Applications: 6
- Data Management: 6
- Content Management: 1-2
- Change Management: 6
- Analytics, Reports, and Dashboards: 6
- Process Automation: 7-8
The pass score is 65%. Doing the math, you can tell that you need to answer at least 39 questions correctly.
This doesn't seem too much, but each question generally has a multiple-choice format, which means that each question can have more than one right answer, increasing the difficulty level.