N.I.T. Palmer, Alaska
Instructors can be lazy. Often observing you or even testing you (without your knowledge) from the break room window while sipping coffee.
Mixed information from different instructors. One will say that is perfect, while the other will tell you never to do that? One instructor was even talking to his wife on his cell phone while giving predriving instruction, causing the student to almost miss a turn and stalling the truck because of it.
One appears hard of hearing, so during the walk around testing, marked off student for things that had been inspected? Failing the student?
One instructor barks orders instead of teaching.
The plus side, is they are informative about what trucking companies are good to work for. A few instructors appear more patience than others. If you are lucky you will get one.