STUDENT ACCEPTED TO A UNIVERSITY IN SHANGHAI?

hey, so i am a high school passout who has got into a university for bachelors (4 years course) in Shanghai, China.
i shall be getting JW202 and Invitation letter from my college, however, i need to know more about the temporary resident permit? do i get it only after i have landed in shanghai? or should i request my college for documents regarding same right now itself?
also, student X is for 30 days only, so, if i apply for it in June (have to report in college in August) will it be valid for month of august? as in, does X validity starts the day you get the it (like the tourist L)? or, what? how does the validity work?