I got F visa for 90 days with single entry to do my student exchange program in Shenzhen

Abida, first, you need to prepare your passport, a completed application form, and a passport-style photo taken recently, the registration form of temporary residence, invitation letter from the exchange program and other relevant documents, and then submit the application to the exit and entry administration of the local PSB 7 days prior to the expiry date of your current F type to apply for the extension.