Scarlet-LPN: I also took the TEAS without studying. I took it in 2017 and scored 70-75 in reading, math, and science. I scored an 87 in English. I retook it two days later to try and improve my scores for a different school. I think my nerves must have gotten the best of me because I got 80's in math and reading, but my science went down to 60 and my English when down to 50!
Out of both tests, I'm more worried about the TEAS. As for the Kaplan, Ive heard from two people, who are in the program now, that it was mostly about delegation, knowing the scope, and knowing certain information such as joint commission, ect. Hopefully that helps a little bit!