How to pay social security+how to deal with refund during full-time postgraduate study?

Dear you, you need to do this: the part paid by social security itself is generally not refundable. After paying social security, you can transfer social security to your work unit after graduation. If possible, you can stop paying social security or continue teaching during your study. It's up to you. Full-time graduate students need to take the national unified entrance examination for postgraduate students (referred to as "unified recruitment") every year1February, and obtain postgraduate status after being admitted. It belongs to the elimination and selection system, and merit-based admission. I hope my answer is helpful to you. I wish you a happy life, dear!