ISO has five systems: quality management system, environmental management system, occupational health management system, food safety management system, risk analysis and key point control management system, and medical device quality management system. As long as you do one of them well, you can get the internal audit certificate.
To get the certificate, you need to learn the changes of the old and new versions; Standards and terminology of the system; Steps and key points of establishing management layer; Understand the main points of system standards; Planning and preparation of internal audit; Implementation of internal audit; Prepare, approve and distribute audit reports; Review the implementation of follow-up activities.