"Grade" (Recommended for most) is a diagnostic to test your skill in comparison to your grade level. This will determine whether or not you are struggling, in the middle, or excelling. This can help prepare us for the next diagnostic, "Test". "Test", (Recommended after "Grade") is to determine where your intelligence/knowledge lies. If you believe that you are exceeding/struggling, and want to know how much you are doing so, this is for those.