Lots of people think that newhire class at a regional is college. They party, act like idiots, don't study, etc. Save that for the crashpad once you have your job and are done with training. Airline ground school is extremely important to the future of your career, take it extremely seriously.

Aside from that, paying $150,000 for flight school doesn't make you that great of a pilot, and nobody instructing you wants to hear it. You don't know more about flying an RJ than your check airman no matter how many classes you took at ERAU or what "jet prep" program you went to. Pay attention and go in with a humble attitude wanting to learn.