hi Will, I spent the money and bought a bunch of practice exams off exambank before writing my exam. It's difficult to find study materials to bring you up to speed, so for that reason I recommend working with a company as an apprentice and learning as much as you can about electrics before attempting to write. An automotive mechanic will never pass that test by winging it, electric trucks are very different from anything you'll find in an automobile. Even a good understanding of hybrids won't help much.
There's some good advantages to working for a forklift dealer, the biggest one being no flat rate system, but promises of $27-32/hr wage earning potential carry with them high expectations of proficiency in electric drive systems, batteries and chargers; without these skills you will hit a glass ceiling of about $18-21.
If you are determined to do what you can to pass this test as soon as possible and get your license, you can start with purchasing a block of practice exams and google the questions you can't answer as study guides, but I don't think a license acquired in this way will get you the results you want. It won't take long for a supervisor to discover where your proficiency level is, and if it's not where it needs to be at the wage level you negotiated you won't last long.
The forklift industry is a trade in which certification is voluntary, and the license doesn't carry the same security that it does in the automotive trade. Don't let that discourage you, a lot of people I have worked with in the past got into this trade the same way you are and made successful careers for themselves and the license came later. Your automotive background means that you'll be starting at 2nd or maybe 3rd year apprentice wages until you get up to speed and get licensed. But electrics are what will get you to the top wage.