Well, if your school has uploaded files, you can log in to your background and look for files in the tree directory for query; If the school has not uploaded it, you can check the file forwarding address on your employment agreement; If you don't sign the contract, your file will be sent back to the People's Social Security Bureau (in the province) or the Provincial People's Social Security Department (outside the province).
In addition, you can directly call the graduate employment guidance center or your college.