If you are running out of time, and need your scores ASAP then might as well re-schedule and take the risks. I recommend a lot for you to study (books, etc.) but since you don't have that much time, then go online, and watch MOMETRIX youtube videos, and do their practice tests. Similar, or actually the same situation happened to me 2 years ago. I applied for CSUs and some UCs for Fall 2015, but I needed to get as high as 80% on my TEAS. So, I took my TEAS V on January of 2015, and got >70%. I did not get any calls, or anything from those schools
. I was very confident that I made it to the cut, but I was wrong.
So, if I were you, go register, and take the risk!