if i get a tourist (L), i can change it to residence permit (student) in china easily?

i wanna ask if i get a tourist (L), i can change it to residence permit (student) in china easily, and what i have to do when i go to china, the point is i have my Original and photocopy of the Admission Letter issued by a school or other entities in PRC and Original and photocopy of “Visa Application for Study in China” (form JW201 or Form JW202). but my JW201 form registration deadline is already gone my school said i can take a tourist L and they will help to change it so i wanna make sure from this because i is too risky to get tourist L and end up to go back after one month. so please help me and tell me what will happen if it possible.