Can Anyone Recommend A Good Free Textbook for Applied Mathematics?

I intend to start classes at my local community college for a Manual Machining certificate (just as a hobby, so no CAM needed). However, I have done no advanced math since college, and barely passed back then. I would like to find a text that would allow me to get some preparation in beforehand, so that I am not going in blind. Could anyone here point me in the right direction? Thank you in advance for any help you can provide.