Attention: you cannot write anything on the paper that you get from the testing center. All the paper will be used only for writing purpose. Sometimes they will warn you that you cannot write anything on the paper until you get to the essay section, otherwise it will be consider cheating. Be careful. And good luck.
I remember I asked the supervisor if I can use the paper for the reading section, the guy said YES! (I cannot remember if I really did some notes or not for the reading, but I already got my official score)
So, my suggestion is that you'd better ask the supervisor directly when you are taking the test.