In Rhode Island, I called DEM..or whoever it was , and they sent me PREP Material, books and pamphlets, in the mail which I studied at home Off and On until the
Proctored Exam a month later.
I also went on line and took sample exams. Every time you took a sample exam..and then took it again..there would be a whole new exam with shuffled questions..and new questions.
When I went for the Proctored Exam, there were probably 50 people at long tables taking the exam...Elbow to elbow. It took me no more than 20 minutes to go through the questions TWICE..and I was done. The plastic (Credit Card Like) certificate came in the mail a couple of weeks later.
NB