Sounds like you got ripped off. No training manual and no full time lecturer? What kind of place is this? I'd ask for my money back and then walk away. You probably could have done just as well, if not better, by taking a course on line.
Try an Internet search on "AutoCAD"+"exam". In the meantime, I'm sure someone else will come along with a recommendation. I'd also suggest practicing a lot on your own by drawing everyday objects one might find around the house.