Been 20 years since I was in school...Help!

I'm not sure what test you'll be taking, but you should be able to find study guides at your local library or bookstore. I took the NET (Nurse Entrance Test). It covered Mathematics, English (grammar & reading comprehension) and to a lesser degree, Microbiology, A & P, and reading speed. I used a study guide from the library. Much of the test is basic arithmetic & grammar skills.
Best wishes & good luck!

I had been out of school for 32 yrs when I went back for my ADN
I made it just fine & I am sure you will too! Good luck to you!