There must be more than one test, because I see it/them referred to by different names. We took the "PSB." To this day, I do not know what the initials stand for!!!
ARCO puts out a great prep book. I saw several copies yesterday at Half Price Books (maybe there is one near you?) or they can be bought new at Barnes and Noble, and surely other bookstores.
I had to retake my prereqs because they were more than five years old. (I'm not sayin' how many more years than five!). I took the PSB before I retook anything.
If you enjoy math (like, arithmetic) and if you have a grasp of basic science, you may do well. If you are not permitted to retake the exam (and you can find this out from the nursing school
administration office), then take practice tests someplace else and prepare for the admissions test, then take it after your prereqs are done.
Hope that helps! (BTW, I'm not genius, but I like math and science--I was in the 97th percentile or above on my PSB, except for --ack!--reading comprehension, where I placed solidly in the low 80's. I hadn't applied to school, and I actually got a call from the then-director, asking me to apply. Stranger than fiction!)