How hard is the CBEST? I am considering becoming a substitute teacher and have to p the CBEST?

I have a BSBA, and a AA in liberal studies, but i haven't been to school for 15 years. I am considering becoming a substitute teacher in CA and need to take the CBEST to finish my credentials. How hard is this thing. If i take a cl on the CBEST does it help. I am good in business and have a lot of experience, but i'm sure that my academic skills need sharpening.. Is there hope?