I was a GED tutor for two years... It's really common to not pass on the first try, so don't get discouraged if you have trouble; it happens to the best of us. Most of the people I worked with ended up taking it multiple times before they passed (And
not because I was really bad at my job; it wasn't a one-on-one program, and everyone worked really hard for the students. Hahaha, I had to come back and edit all of this in because I just realized how utterly incompetent that made me sound). Good luck with your test.