

Passport and Resident Permit Expiry, Missing Documents
I am a student studying in Guangzhou for 6 years, I started this October and will end on 2023. My residence permit will expire on July 16th and my passport will expire on July 17th.
So I am planning to go back to my country, Indonesia, January to February 2018 to renew my passport and then extend my residence permit after. The problem is when I applied for the university, I didn't get my JW202 form. Instead, I used another university's JW202 form to apply for the visa, and now the university is keeping the other university's JW202 form. And I've lost my admission letter somewhere (pretty sure I can get a replacement though).
So what should I do? Do I need to apply for a visa? And what are the requirements for extending a residence permit in China? Thank you.