Hey @180pronto, welcomeaboard. A BR is kind of like an untimed test, but there are a lot of really important distinctions. Go review the BR lessons in the curriculum, JY explains it far better than I could.
Welcomeaboard!!!! It's good to do one at a time. I actually read the trainer before enrolling with 7sage but now that I'm redoing the core curriculum, I will be technically starting with 7sage and finishing up with the trainer. It's such a superb book.