It doesn’t sound to me as though this is about test taking, it sounds to me as though you need a different strategy for studying and classroom learning.
I agree that the both the prof’s office hours and the student success center might be good starting places.
Also, what strategies worked in high school?
Are you getting enough sleep, or enjoying your new independence to the point where it’s interfering with your ability to pay attention? Are you eating right? That counts too.