Hi there, so auditing management to verify the system is effective is a great idea. I have followed this approach with ISO 13485:
Section 4 Quality Management System (looking at sub-clauses like document control, documented quality manual and quality records)
Section 5 Management Controls (looking at sub-clauses like management commitment, policy, management review (verify system is working here and in control)
Section 6 Resource Controls or Management (check sub-clauses like sufficient personnel, including internal auditors; competence, awareness and training; look at skill retention times, and more)
Section 7 Product Management (lots of sub-clauses like verification of process to build product; purchasing controls; calibration; design controls;
Section 8 Measurement Analysis and Improvement (various sub-clauses like controlling measurements, provision of feedback, complaints, internal audits, nonconforming product and corrective and preventive action.)
Through all of these sections, look for opportunities for improvement and how they are controlled and documented.
Those are the five sections I would suggest. Enjoy!