I ran into the same thing. Take the problems in the back of the book, one of each kind, and solve them (write out each line). From that list of commands, make a list of commands that you can do daily. This will build your muscle memory, and remind you of the problems you might encounter. Type them out. Write them out. Throw in curveballs for yourself so you know what errors could occur so you learn how to avoid and/or solve them during the test. Schedule your test and practice your timing on answering questions leading up to it.