The unit said that the employment and unemployment registration certificate is required to apply for social security.

Whether it is necessary to have an employment and unemployment registration certificate, please ask the social security bureau of the unit participating in the insurance. The regulations vary from place to place

Normally, when joining the job, the employment and unemployment registration certificate must be submitted to the unit to register the employment information, and when leaving the job After the unit registers, the registration certificate will be returned to you

This does not conflict with your postgraduate entrance examination or graduate school graduation. The employment and unemployment registration certificate is the registered work information. You have a job now, even if it is not on the employment and unemployment registration certificate. Registration should also be recorded in the file, or the employer has paid social security, which will also show that you were employed before the postgraduate entrance examination