1. Employers don't need it: some employers don't need job seekers to provide health certificates, so graduates don't need to provide them.
2, the school does not require: some universities do not require students to provide health certificates when they enter school, so graduates do not need to provide them when they graduate.
3. Failure to apply in time: Some graduates may not apply for health certificates in time, which may lead to the inability to provide them when looking for a job.
4. Health status does not meet the requirements: some graduates may not be able to provide health certificates because their health status does not meet the requirements of the employer.
5. Economic reasons: Some graduates may not be able to pay the cost of health certificates due to economic reasons, resulting in the inability to provide them.