Each module is reading you do when it suits you, bench work with someone experienced beside you, and a knowledge test that shows you what you've got. Work them in order. Each one builds on the last, and by Module 6 you're diagnosing electric vehicles you've never seen before.
Read the whole first module before you decide anything. You don't need an account. Modules 2 to 7, the knowledge tests and your saved record come with enrollment, and the error code library is free for everyone.
