S1 and X1 Visa

Hi,
I am Sri Lankan. I stamped S1 type from Saudi Arabia when I was working there. I didn't enter the PRC yet from S1. it is available to go until next month. Now I got scholarship and X1 type documents. Now my purpose is studying. So do I need to apply X1 type or can I enter with S1 type transfer permanent residence into study type? Is it possible within China?