You will pass. Pay attention in class, do ALL the homework and studying, and follow the instructor's requests for your on-the-road sessions. Do not pretend to know things that you don't.
Use your mirrors. "Steer from behind." You want to know where the hind end of your trailer is. The mirrors tell you where you are. When you take the test the examiner will be watching your use of the mirrors.
The front of the tractor turns wider than the trailer, so you must position in advance for that. In earlier times the advice was "Don't cut corners," which meant making sure your horse kept wide so the wagon didn't fall into the ditch.
Some people find it helps to practice backing a little garden tractor because it'll jackknife so abruptly, much more than a big rig, and teach you how to anticipate.