I got mine by simply taking the test, but I knew a lot of the basics such as: hydraulics, hand signals, and safety regs. If you need to study these things, I would try one of the local schools that are listed in the Herald. I think they even sponser you and cover the testings fees. This way you are sure to pass and you'll be able to list the school on your resume. I operate my father's equipment and my own on an as needed basis, as I'm civil engineer, not a full time equipment operator. For anyone who operates full time, the more training you can list on your resume, the better.
I would highly recommend anyone who operated equipment to also take the 40hr OSHA HAZWOPER training as well.