You are a student right? If yes, you need to join a tour for at least 5 persons for a group tourist visa. Chinese embassy in Pakistan does not issue tourist visa to individual applicants. Contact this China Travel Agency(https://www.travelchinaguide.com/) for an invitation letter. And also, you can check China Tours(https://www.travelchinaguide.com/tour/default.htm) if you need info for good China travel itineraries.