Is there a book or study guide somewhere for CNAs?

I was certified for a Nursing Assistant about a year and a half ago and never used it and im going to start using it soon. Problem is, i forgot how to do some things. Things like blood pressure, vitals, food charts, showers and bed baths, washing hands i know. Just things like that involve mLs and CCs, bed making, and other things i want to touch up on. I just dont want to apply, become hired and then some things i look dumb and stupid because i dont remember. Is there any programs or books to brush up on some things that cnas do?