How do I have to do with my residence permit?

Hi, I have applied for a X1 visa, I am going to attend university from february 20th till july. But I will be in PRC from December 9th, so more than 2 months before the start of my course. In that case I won't be enrolled at school yet. I know that I have to go to the police within 30 days of my arrival, the thing is do I have to be already enrolled at school to obtain the residence permit? If yes, what will happen to me?? :/ Do I have to postpone my flight and arrive in less than one month before the start of my course?
Thanks